Malicious PDF — malware analysis report

Static analysis result for SHA-256 0218cb5775753ea1…

MALICIOUS

PDF

39.1 KB Created: 2020-04-16 17:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8a8ad40b35cc6f5eb1325285ed048666 SHA-1: 49724a2af2427e3f7f958b6ddc0554c6f3c08fdf SHA-256: 0218cb5775753ea1b4b76f47c00eb726906594175517420a75e3f2c22cce0856
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 other PDF files with numeric slugs, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fit1athletics.com/uploads/1/3/0/3/130323957/130323957.html#vertical+id+card+size+template
    • http://crjcompany.com/uploads/1/3/0/7/130740072/lapogekowaw.pdf
    • http://georgiasselectprocessservice.com/uploads/1/3/0/6/130620929/2698026.pdf
    • http://rayspeaksout.com/uploads/1/3/0/5/130590334/vorazozedazaxesid.pdf
    • http://acornbathworks.net/uploads/1/3/0/2/130291592/481581.pdf
    • http://patriotpricing.com/uploads/1/3/0/3/130324331/4039921.pdf
    • http://migliore-sr.com/uploads/1/3/0/4/130435870/9ca72a337.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000697e.bin
1d04903e351886e1dff5cce53a5e8d33c84374e1a435a72164ad77e10745df3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697E 7484 bytes
font_01_sfnt_off000086ff.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FF 2616 bytes

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