Malicious PDF — malware analysis report

Static analysis result for SHA-256 304116dd43ecacc1…

MALICIOUS

PDF

32.4 KB Created: 2020-05-17 07:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a7ea93c7dcb4061bdb5909a33b3fbe SHA-1: 58d6877953dc14e406a9119d8d867cedbc8440d4 SHA-256: 304116dd43ecacc110c8cc813895618e2ad7ed22575727a79f0da4f5a0ebda87
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a potential link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated but contains references to URLs, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://stopeurocide.com/uploads/1/3/1/6/131606395/131606395.html#bradley+lady+gaga+performance
    • http://healthinbalanceonline.com/uploads/1/3/0/7/130740256/sidule.pdf
    • http://mikeandthebigscary.com/uploads/1/3/0/9/130969699/xizeburavutuvoket.pdf
    • http://cleanforcause.com/uploads/1/3/0/5/130588675/2608439.pdf
    • http://truehopeministries.org/uploads/1/3/0/5/130542728/6971352.pdf
    • http://sienahoefling.com/uploads/1/3/0/5/130588833/pupedujudofumo-mafejirufedow-gekijarot.pdf
    • http://mochisprite.com/uploads/1/3/1/0/131071063/2579734.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000535d.bin
48a6b53d52763f3a656a04163bf426e55ffef0504b5ef90008a647886c5ea75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x535D 10372 bytes

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