Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fde90289eb8da64…

MALICIOUS

PDF

45.0 KB Created: 2018-11-26 20:06:45 +03:00 Authoring application: pdfTeX-1.40.14 (via Revision 5)
MD5: 0f7f47ea6009aecfe4770ec6cf0ed2c4 SHA-1: 37ba27d963385181acbee8450f5363b4dd974164 SHA-256: 4fde90289eb8da64cf3f32bd167f3a7df825309fd002cf9b0ef9fe3eedd4ae3d
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, limiting the ability to determine specific malicious actions beyond the link farm. The primary attack pattern observed is the mass distribution of links to external documents.

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/nuclear-power-in-developing-countries-an-analysis-of-decision-making.pdf
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    • http://www.gorillawalker.com/urbanism-in-antiquity-from-mesopotamia-to-crete-the-lib
    • 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/

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