Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c081c4a4c21007…

MALICIOUS

PDF

22.3 KB Created: 2020-04-09 03:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 69403f50d7a1d9774d63df249f93a604 SHA-1: c4ee9c573b3183307b525b491aa5c77d2e003cd7 SHA-256: 77c081c4a4c21007656f6c1aced656ea40abe781ac9fa473d1949e00c651b133
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though partially obfuscated, contains keywords related to free PDF downloads and the authoring application, likely to attract search engine traffic. The ML classifier strongly indicates maliciousness, and the numerous external URLs are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://carolyn-blackmore.com/uploads/1/3/0/7/130739185/130739185.html#huesos+de+lagartija+pdf+descargar+gratis
    • http://austinsbestdjs.com/uploads/1/3/0/6/130605498/5189616.pdf
    • http://barquinsleaders.com/uploads/1/3/0/5/130551190/bc08f17bd3.pdf
    • http://healinghandssurgical.com/uploads/1/3/0/4/130477584/kozavebofij_pirobigazakodep_pokemaxivaveza_wewufonuw.pdf
    • http://alenstransporte.com/uploads/1/3/0/5/130541208/takali.pdf
    • http://desatascosmataro.com/uploads/1/3/0/6/130620482/pebimifujewexozukow.pdf
    • http://rakennuslehtisalo.fi/uploads/1/3/0/5/130540788/3ad6e3333d.pdf
    • http://futureglobalaerospace.net/uploads/1/3/0/4/130435985/b152a.pdf
    • http://amyisawriter.com/uploads/1/3/0/6/130604077/2c524.pdf
    • http://glprod.com/uploads/1/3/0/4/130483537/zamop.pdf
    • http://harvestsupportservices.com/uploads/1/3/0/8/130873954/satevegide_lapaxevotamigi_ripenenujaja.pdf
    • http://notallroses.com/uploads/1/3/0/4/130476372/3251003.pdf

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