Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcddec736603e7d5…

MALICIOUS

PDF

28.2 KB Created: 2020-04-24 05:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: beca036715633919b286291b721267ad SHA-1: 21e31a99c2bd5b836ff901663df6e60ad007f02e SHA-256: dcddec736603e7d515ee25f585148c70bce3e6f5475cfd99e0606f267b807646
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier with high confidence. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to other PDF files hosted across various domains. This suggests a tactic to manipulate search engine results or distribute a large volume of content, potentially malicious, to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://divineresumeservices.com/uploads/1/3/0/4/130491253/130491253.html#neuralgia+facial+atipica+pdf
    • http://gogirlfashions.ca/uploads/1/3/0/7/130739892/vomusa-baxutegofi-kejigewusa.pdf
    • http://dorisnoble.com/uploads/1/3/0/4/130489081/227099.pdf
    • http://electstuartcollis.org/uploads/1/3/0/7/130739377/1757437.pdf
    • http://desjardins.ch/uploads/1/3/1/0/131070113/dixekudisotuwinafot.pdf
    • http://tattoosbyjessvann.com/uploads/1/3/1/4/131408369/90462.pdf
    • http://messiahsmum.com/uploads/1/3/1/4/131405927/filekofipozidi_gikiko_wuwisuxi_bopureta.pdf

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