Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed315c36d464fd34…

MALICIOUS

PDF

25.9 KB Authoring application: GIMP
MD5: f41731b4741c0d1327ab604ece13dfbf SHA-1: 7b69e674806f2eff251fcbe340cbc594169524e2 SHA-256: ed315c36d464fd34fda0ca16ad78a51a96e175540fe9505f461381af8d970ffa
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links to external PDF documents hosted on various domains. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest a phishing or traffic redirection scheme. The ML classifier also flagged this PDF with a high probability of being malicious. No scripts were extracted, but the primary attack vector appears to be the extensive link farm designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gon.amati-mobili.ru/uploads/2020/01/28/c0d5f77.pdf
    • http://michiganinsuranceguru.com/uploads/1/3/0/5/130590219/1619634.pdf
    • http://fixonolidi.heartplayers.com/uploads/2020/01/28/bekopotonevo.pdf
    • http://namicas.com/uploads/1/3/0/6/130604458/22f71.pdf
    • http://insitesafety.com/uploads/1/3/0/4/130475936/lusudok.pdf
    • http://suehail.com/uploads/1/3/0/4/130435892/4861631.pdf
    • http://artofmoses.com/uploads/1/3/0/5/130588672/d7bca97c05.pdf
    • http://somemecosmetics.com/uploads/1/3/0/2/130273804/130273804.html#un+yemen+report

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fd7.bin
2845f650851edd7ecc43f2d0ec18485e6c02d96eb7f42d19de7d4dfdd2a17b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7 6520 bytes

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