Malicious PDF — malware analysis report

Static analysis result for SHA-256 821eda79cd0b7f51…

MALICIOUS

PDF

46.0 KB Created: 2018-11-14 21:15:04 +03:00 Authoring application: PScript5.dll Version 5.2 (via ePapyrus PSI 8.51)
MD5: 371689ad2a30712d148ee2d96fb727a1 SHA-1: 502426c03d2cab2dcf6bce683d446504b915a4e4 SHA-256: 821eda79cd0b7f51566aed7855c3c53f3a78172ddb99714b4f544b237e910f34
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest an attempt to redirect users to a potentially harmful website. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8812

Heuristics 2

  • 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.
  • 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://www.gorillawalker.com/analysis-of-the-behaviour-of-advanced-reactor-pressure-vessel-steels.pdf
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    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/extension/
    • http://www.aiim.org/pdfa/ns/schema#
    • http://www.aiim.org/pdfa/ns/property#
    • http://www.aiim.org/pdfa/ns/id/