Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d6e8d12de67d36…

MALICIOUS

PDF

31.4 KB Authoring application: Nitro PDF
MD5: 7171f4b35c15d9a5d5772960807e7134 SHA-1: df01f48a1dc1288d42b87aeed9a7e02b017de759 SHA-256: 78d6e8d12de67d3663cbac4078d8439ccd901a7e07d64addf98699a752ed84b4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO spam or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the sheer volume of linked PDFs suggests a content distribution or manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://morriscorporatecenteriii.com/uploads/1/3/0/6/130605230/5841308.pdf
    • http://charlesriverrowingcamps.com/uploads/1/3/0/6/130603906/madavu.pdf
    • http://akashachamberlain.com/uploads/1/3/0/5/130539021/297c88.pdf
    • http://suor.pt/uploads/1/3/0/4/130488619/b41aedd44ee2b.pdf
    • http://dragoonitcn.net/uploads/1/3/0/5/130546657/4e4b3eaaad466.pdf
    • http://tetagam.wisdom-olga.ru/uploads/2020/01/28/gokesalidifetowo.pdf
    • http://abraxasband.net/uploads/1/3/0/5/130588947/d09344a0ea1a0e.pdf
    • http://tbbotma.weebly.com/uploads/1/3/0/5/130590588/4e9004421e.pdf
    • http://ccocciboutique.com/uploads/1/3/0/2/130273931/tefeg_luzaz_sulurodolaj_fakusapusuval.pdf
    • http://picturemachines.com/uploads/1/3/0/6/130604283/9446780.pdf
    • http://momujik.lizalaskina.ru/uploads/2020/01/29/soratanuvete-gopugupunub.pdf
    • http://mval.org/uploads/1/3/0/7/130739011/130739011.html#capitulo+1a+vocabulary+check+sheet+1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000128d.bin
b409965d9d22d5ad0066e7ee98f2649d6ba353cc4ddf41497962db3fabde32d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128D 7752 bytes

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