Malicious PDF — malware analysis report

Static analysis result for SHA-256 98eb52a6179d9c9c…

MALICIOUS

PDF

41.3 KB Created: 2019-04-07 18:03:28 +03:00 Authoring application: doPDF Ver 7.3 Build 391 (Windows 7 Home Premium Edition (SP 1) - Version: 6.1.7601 (x64))
MD5: f2c096cc593cc344e00ae7ad46f2bcb5 SHA-1: 5872403914644f5c22d4c5e48c396e5d6e4f050d SHA-256: 98eb52a6179d9c9c91ad0d1dd47e6281d9bc1e91dfa31147ae0216cde51a85e3
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, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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.
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    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
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    • http://ns.adobe.com/xap/1.0/
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    • http://www.aiim.org/pdfa/ns/property#
    • http://www.aiim.org/pdfa/ns/id/

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