Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ae88c74751552a…

MALICIOUS

PDF

31.2 KB Created: 2020-04-05 13:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6523dd4b3980c6733f2f47591f3b91be SHA-1: e19d64b2a8b62f0058ea2b2362a328fc4eb3523d SHA-256: 69ae88c74751552a9c929c6a58811fa60146b1b2f64dbca319184fe2924093d0
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 PDFs hosted on similar domains, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely serve as a lure to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://salesnoodle.com/uploads/1/3/1/4/131453018/131453018.html#el+acto+administrativo+pdf+resumen
    • http://gkgtraining.com/uploads/1/3/1/3/131397960/lemotilavizasere.pdf
    • http://jkjenterprises.org/uploads/1/3/0/5/130550693/solemujineberomasusu.pdf
    • http://nataliegoldfein.com/uploads/1/3/0/9/130969054/warufosuwerora.pdf
    • http://jmrrealty.net/uploads/1/3/0/7/130739864/185bb.pdf
    • http://lakehouseatlakeofthewoods.com/uploads/1/3/0/6/130621132/6215381.pdf
    • http://prestomagictricks.com/uploads/1/3/1/1/131164211/dinaboro.pdf
    • http://opweekdayschool.com/uploads/1/3/0/6/130621200/4312417.pdf
    • http://mooretravel4fun.com/uploads/1/3/1/4/131408022/c61bfd59b45.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_off0000539a.bin
aa78d268aa506b0964eae95816e004d877a33309e75ec24a85dc1a6d1c38b0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x539A 7476 bytes

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