Malicious PDF — malware analysis report

Static analysis result for SHA-256 092651ae0303df9d…

MALICIOUS

PDF

38.3 KB Created: 2020-03-29 14:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3261095c981811e5813a86343bb58374 SHA-1: fb74318bc4fc5827f23263273fe17c07f1126701 SHA-256: 092651ae0303df9d80c1d0b64c1561c9ab9514b1dd27747c2af930898f6fb2ab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, suggesting a coordinated effort to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links indicates a high likelihood of malicious intent, possibly for SEO spam or as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rehphotography.org/uploads/1/3/1/3/131381332/131381332.html#twenty+one+pilots+black+hands+and+neck+meaning
    • http://buyfrombruce.com/uploads/1/3/1/0/131070115/zexesedikulujef.pdf
    • http://katherynragle.com/uploads/1/3/0/5/130590622/2194332.pdf
    • http://bytesoflife.net/uploads/1/3/0/4/130483295/ruzerali.pdf
    • http://masemanleatherwork.com/uploads/1/3/0/7/130739540/diwixonosem.pdf
    • http://dzire2inspire.com/uploads/1/3/1/3/131380627/kibilitijereruvu.pdf
    • http://dustycockatoo.com/uploads/1/3/1/1/131164273/dotawodufezoweloxu.pdf
    • http://asapstumpremoval.net/uploads/1/3/0/5/130540823/7861100.pdf
    • http://ilfuego.com/uploads/1/3/0/7/130775876/sepotosagu-mumuwam.pdf
    • http://spectaclesbroadway.com/uploads/1/3/0/7/130775870/vixar_kutemenovuvivu_poxuvuwuwogud.pdf
    • http://engagedencounterutah.org/uploads/1/3/1/3/131384098/tisigenulotowezopi.pdf
    • http://animasbodywork.com/uploads/1/3/0/2/130273625/zazitagi.pdf
    • http://o365advisor.com/uploads/1/3/0/6/130621238/37773566a9951.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_off00006dc1.bin
56f024e894a16a10b1833d90f7bcaf5c00b4b8c7563954afe26e456c9d84d6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC1 7820 bytes

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