Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38263a9d2b47ed1…

MALICIOUS

PDF

40.0 KB Created: 2020-03-20 12:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2abfd4e57e7319cb4e78d183bd28fe9 SHA-1: c18925828a9210901e1bdd1a75fa534c54bf795c SHA-256: c38263a9d2b47ed1c3d1e2f34b66b7a0674a0deeea612b79ca9a3970bd5eacd9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF contains a large number of external links pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict.

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://klud.org/uploads/1/3/0/6/130620848/130620848.html#evolucion+de+la+administracion+en+mexico+y+america+latina
    • http://robsvirtualretirement.com/uploads/1/3/0/6/130603986/lelesanugepimasalubo.pdf
    • http://oilsfortriathletes.com/uploads/1/3/0/5/130589297/gipepivekotex.pdf
    • http://magneticbrandevents.com/uploads/1/3/0/8/130814339/3069821.pdf
    • http://ltvtproductions.com/uploads/1/3/0/6/130620585/542cb.pdf
    • http://www.mightysweets.com/uploads/1/3/0/4/130436049/tasanalu_folekew_miloxuxigatida_sojasuma.pdf
    • http://mobilephlebotomynorthcarolina.com/uploads/1/3/0/6/130620173/xabizilopotajimireg.pdf
    • http://admin.zangkoorpraisethelord.nl/uploads/1/3/0/5/130551154/728321.pdf
    • http://www.benfrankk.com/uploads/1/3/0/5/130590312/5eb8193f3979.pdf
    • http://disneychristmasparty.com/uploads/1/3/0/2/130289063/8288749.pdf
    • http://phelpscountyhumanesociety.org/uploads/1/3/0/6/130639558/fadebunom-vijewinidis-bizusozulo-pogabilusij.pdf
    • http://refugechurchva.org/uploads/1/3/0/5/130588721/5732928.pdf
    • http://toptierhealthandfitness.com/uploads/1/3/0/6/130622005/gokizaturozemu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab2.bin
27b83c31a4c0fb69a2b5445a84ded83def3818eb49ae0cf72fe8c97b68521216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB2 8224 bytes
font_01_sfnt_off000088ca.bin
84c8fc2357b131a6e7f9b951755245f9c194b96812ad5f3a41881e75f1419688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CA 2644 bytes

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