Malicious PDF — malware analysis report

Static analysis result for SHA-256 0806a47161720777…

MALICIOUS

PDF

36.6 KB Created: 2020-04-12 17:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0763243fc21e144973c21095069e21b3 SHA-1: 831c9c894b4595d309c0a9c8d0053ee86966c82c SHA-256: 0806a47161720777b35b2ae1f5bad88a9189d48b97ef2182b08895e9df95db54
96 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 seemingly unrelated domains with numeric or generic slugs, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://linksartllc.com/uploads/1/3/0/6/130621485/130621485.html#graphic+artist%27s+guild+handbook+of+pricing+and+ethical+guidelines+pdf+download
    • http://kcmoliere.com/uploads/1/3/0/3/130324011/19117b.pdf
    • http://maspizza.org/uploads/1/3/1/4/131409861/1652058.pdf
    • http://hydrocleanasheville.com/uploads/1/3/1/3/131380899/lijibekotumafigarow.pdf
    • http://specialeducationworkshops.com/uploads/1/3/0/4/130476318/6302171.pdf
    • http://tamarasmassage.com/uploads/1/3/1/0/131071057/6016533.pdf
    • http://profinancialinsservices.org/uploads/1/3/0/3/130313156/02802fa76c036.pdf
    • http://treemendousnursery.com/uploads/1/3/1/3/131379948/jijogazudisudubedeva.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_off0000677b.bin
87044c496507749f01b8113d09b8ecfe301d191efeb2030338c0f0e282947c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x677B 7776 bytes

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