Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac952f12fba5812…

MALICIOUS

PDF

48.9 KB Created: 2020-03-14 15:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 60508c6426fb2b571a75342977634125 SHA-1: fdca1ba93178501de95128e0760af9d1daf8493b SHA-256: 5ac952f12fba58122cced39f129467d33dbb72ac33897261471c319c22538b0e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme, potentially designed to distribute malware or lead users to phishing sites.

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://fourheadlaser.com/uploads/1/3/1/0/131069950/131069950.html#router+bushing+guide+diy
    • http://irvingunnerving.com/uploads/1/3/0/5/130547659/purevovola.pdf
    • http://rockersandrollers.com/uploads/1/3/0/7/130776073/0843b33639f.pdf
    • http://contractorwholesale.com/uploads/1/3/0/5/130550898/kibuginodilegofat.pdf
    • http://incartix.net/uploads/1/3/0/5/130588545/rabamupomedibi-karakito-levasejo-wasujew.pdf
    • http://postmaster.lionahazeleger.com/uploads/1/3/0/4/130488370/balazisolus.pdf
    • http://pchelpformom.net/uploads/1/3/0/7/130739101/690581.pdf
    • http://enamelchannel.com/uploads/1/3/0/4/130476908/ce5779109d8010.pdf
    • http://adieinteriors.co.uk/uploads/1/3/0/9/130969461/d9c57aba047e3c.pdf
    • http://mkjsolutions.com/uploads/1/3/0/7/130740164/firexudubagajir.pdf
    • http://www.linguavox.com/uploads/1/3/0/2/130272260/4953751.pdf
    • http://labphotographylab.com/uploads/1/3/0/6/130604196/milezi-pabupasutim-safeg-junobazon.pdf
    • http://www.keyannagotay.com/uploads/1/3/0/4/130483633/4955294.pdf
    • http://webmail.147east.com.au/uploads/1/3/0/5/130551401/daforoze.pdf
    • http://northeastgridironpromotions.com/uploads/1/3/0/5/130539155/0324c4b099e9.pdf
    • http://www.etymobeauty.com.au/uploads/1/3/0/9/130969404/a7de2d2797dc260.pdf
    • http://gajon.info/uploads/1/3/0/7/130776264/wedosuwabapef.pdf
    • http://cleetusandcars.com/uploads/1/3/0/2/130289653/juwekover_xifeduwovamug.pdf
    • http://waggonerfamilypainting.com/uploads/1/3/1/0/131070431/57fd66589.pdf
    • http://rrgbb.team/uploads/1/3/0/6/130620811/nejiruneta.pdf
    • http://www.wrestlingunmasked.com/uploads/1/3/0/6/130621205/kepusa_kadazut.pdf
    • http://3cfxinvestment.top/uploads/1/3/0/6/130604475/boratokigowewaganabu.pdf
    • http://www.sadams01.com/uploads/1/3/0/4/130490277/pinulewix.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_off0000939c.bin
33530f30c37482bb58a1a963f68ec9b0ffa104dad3d87287984ddc49106ea6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939C 8996 bytes

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