Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9d90d9dc6d4b2b…

MALICIOUS

PDF

30.3 KB Created: 2020-04-16 13:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb3a3e87dc42041df7deaf4f81f7879b SHA-1: ea3f498f2160605febc6ee7a51a6c97304bd40a1 SHA-256: ab9d90d9dc6d4b2b811c23697e5989464fa57d22c8efb6efd09db5dafd37a607
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though heavily obfuscated, contains text related to 'Depeche mode enjoy the silence piano sheet' and the wkhtmltopdf tool, suggesting a lure to disguise the link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to manipulate search engine results or distribute content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://burgerindustries.net/uploads/1/3/0/4/130491932/130491932.html#depeche+mode+enjoy+the+silence+piano+sheet
    • http://mcqmedia.com/uploads/1/3/1/3/131384605/5891456.pdf
    • http://sagmeister-wine.com/uploads/1/3/0/2/130272636/keduposefafoki-zafukuxuwulap-xopatuluzetov.pdf
    • http://bitchilante.com/uploads/1/3/0/2/130289270/1724871.pdf
    • http://saulesnamai.net/uploads/1/3/1/6/131636725/9287672.pdf
    • http://kcc-online.com/uploads/1/3/0/8/130873717/renikitujufujow.pdf
    • http://bowtiexpsupport.com/uploads/1/3/1/4/131406354/buvagijezevopubabip.pdf
    • http://emsthetics.com/uploads/1/3/0/5/130540504/130369.pdf
    • http://southwestflaadom.org/uploads/1/3/0/5/130541924/xilozawajelidogexanu.pdf
    • http://owensindustrialservices.net/uploads/1/3/0/8/130874475/todatuxuvuvub-vurinutuva-perulijepudo-veseruxipijat.pdf
    • http://humanfreakshow.com/uploads/1/3/1/4/131437223/6001023.pdf
    • http://unblanket.com/uploads/1/3/1/3/131379253/9179858.pdf
    • http://unplugg-tech.com/uploads/1/3/1/4/131438091/xosevomowevito.pdf

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