Malicious PDF — malware analysis report

Static analysis result for SHA-256 4691fdb050d7bb02…

MALICIOUS

PDF

33.6 KB Created: 2020-04-12 08:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d929d5ced3ded799a0b052a0a909e13 SHA-1: 8027daa8f3eec231e9f0b0926271677b4e96c956 SHA-256: 4691fdb050d7bb0220af1e4647a359195b6ac38dea7045c6948a91239cf18b2f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO spam campaign, potentially designed to distribute malware or phish for information through the linked content.

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://stellarorganizingsolutions.com/uploads/1/3/1/0/131069968/131069968.html#preterite+tense+forms+practice+quiz+spanishdict
    • http://officialbluehangers.com/uploads/1/3/0/2/130272921/luzerakonagozugedi.pdf
    • http://www.alive-tattoo.com/uploads/1/3/0/3/130379673/be878.pdf
    • http://invinciblewillllc.com/uploads/1/3/0/7/130775817/subilosem_peduf_sokel_kufuxosogakorob.pdf
    • http://clonmannoncarecentre.com/uploads/1/3/0/5/130588618/c1336f2d92cac3e.pdf
    • http://travelvisa.my/uploads/1/3/0/9/130969062/jazijavoreta.pdf
    • http://buythebirdseed.com/uploads/1/3/1/1/131164319/lolujutigu.pdf
    • http://ran-eportfolio.com/uploads/1/3/1/4/131453630/3102452.pdf
    • http://bestmena.com/uploads/1/3/0/5/130588716/5365192.pdf
    • http://springbokinvestors.com/uploads/1/3/1/3/131383721/8675350e3e5eea.pdf
    • http://oceanviewpatriots.com/uploads/1/3/0/7/130739028/9036983.pdf
    • http://singaporeangranturismo.com/uploads/1/3/0/4/130435641/3120959.pdf
    • http://bfndorganics.com/uploads/1/3/0/7/130738855/xikidulezebazen.pdf
    • http://alumbite.org/uploads/1/3/0/8/130874566/winepova.pdf
    • http://mhstransportationllc.com/uploads/1/3/1/4/131406608/lizesurad-rosovet-zagafupoxa.pdf
    • http://sonjajanes.com/uploads/1/3/1/4/131482832/4546271.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_off00005a70.bin
fc603058771304746974e100d807c923f462eb9501c9e5e03e387dbf91938ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A70 8512 bytes

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