A method of determining properties of a wellbore in a formation, the wellbore comprising a casing and an annular fill material between the casing and the formation and mud between the casing and an acoustic logging tool, the method comprising: emitting by the acoustic logging tool an acoustic waveform toward the casing; obtaining from the acoustic logging tool, acoustic data comprising an acoustic waveform reflected from the casing, the annular fill material, one or more interfaces between any of the mud, the casing, and the annular fill material, or combinations thereof; normalizing the acoustic waveform resulting in a normalized waveform, wherein the normalization comprises: transforming the acoustic waveform to frequency domain, resulting in a waveform spectrum; estimating a specular waveform spectrum from the waveform spectrum,wherein the specular waveform spectrum is representative of a first echo of transmitted acoustic waveform from a first interface of the casing; normalizing the waveform spectrum with the estimated specular wave; renormalizing the normalized spectrum with a shaping spectrum, resulting in a shaped waveform; and transforming the shaped waveform to time domain, resulting in the normalized waveform; generating a reference waveform based on an initially estimated thickness of the casing, estimated wellbore parameters, or combinations thereof; iteratively comparing the normalized waveform with the reference waveform and generating a new reference waveform if the normalized waveform does not substantially match the reference waveform, wherein reference waveforms have been normalized; based on the comparison of the normalized waveform with the reference waveform, identifying a best-fit reference waveform that substantially matches the normalized waveform; and determining a thickness of the casing, an acoustic impedance of the annular fill material, and an acoustic impedance of mud, based on the best-fit reference waveform. emitting by the acoustic logging tool an acoustic waveform toward the casing; obtaining from the acoustic logging tool, acoustic data comprising an acoustic waveform reflected from the casing, the annular fill material, one or more interfaces between any of the mud, the casing, and the annular fill material, or combinations thereof; normalizing the acoustic waveform resulting in a normalized waveform, wherein the normalization comprises: transforming the acoustic waveform to frequency domain, resulting in a waveform spectrum; estimating a specular waveform spectrum from the waveform spectrum,wherein the specular waveform spectrum is representative of a first echo of transmitted acoustic waveform from a first interface of the casing; normalizing the waveform spectrum with the estimated specular wave; renormalizing the normalized spectrum with a shaping spectrum, resulting in a shaped waveform; and transforming the acoustic waveform to frequency domain, resulting in a waveform spectrum; estimating a specular waveform spectrum from the waveform spectrum,wherein the specular waveform spectrum is representative of a first echo of transmitted acoustic waveform from a first interface of the casing; normalizing the waveform spectrum with the estimated specular wave; renormalizing the normalized spectrum with a shaping spectrum, resulting in a shaped waveform; and transforming the shaped waveform to time domain, resulting in the normalized waveform; generating a reference waveform based on an initially estimated thickness of the casing, estimated wellbore parameters, or combinations thereof; iteratively comparing the normalized waveform with the reference waveform and generating a new reference waveform if the normalized waveform does not substantially match the reference waveform, wherein reference waveforms have been normalized; based on the comparison of the normalized waveform with the reference waveform, identifying a best-fit reference waveform that substantially matches the normalized waveform; and determining a thickness of the casing, an acoustic impedance of the annular fill material, and an acoustic impedance of mud, based on the best-fit reference waveform.