Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b3151e4474eb64…

MALICIOUS

PDF

33.0 KB Created: 2020-05-20 21:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31879e1ea740158b86031a9f9e323082 SHA-1: 8d46b1eb6ebcfc3cd7d2e40ec7d19463de4fdf56 SHA-256: f3b3151e4474eb640c97f673176861c233a2ae8227a55dfac55c268cc0e4b0f9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the PDF structure and numerous links suggest a lure to external, potentially malicious, websites.

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://app-pof.com/uploads/1/3/1/4/131407877/131407877.html#project+management+the+managerial+process+larson
    • http://bumpkinbaby.com/uploads/1/3/0/7/130738805/kotim_temomatuweda.pdf
    • http://scalaconcrete.com/uploads/1/3/1/3/131378990/jilowegutiw_tulogagelivuteg_mobetuta_gowowudenutesi.pdf
    • http://actionanimals.tv/uploads/1/3/1/3/131383284/d355d939531.pdf
    • http://gwl-services.net/uploads/1/3/0/2/130288392/vanasutikap.pdf
    • http://pestcontrolwiltshire.com/uploads/1/3/0/6/130621114/tunitemunidugunowev.pdf
    • http://jorgetorres-photo.com/uploads/1/3/0/8/130814475/jerudakerotuse.pdf
    • http://michaelmoeh.com/uploads/1/3/1/4/131454620/noputetalupuxis-senunobedemewe-kigiletiri-zawezokage.pdf
    • http://myafara.com/uploads/1/3/1/1/131164204/fcc8a19b85e5bde.pdf
    • http://venesceramics.com/uploads/1/3/1/0/131070204/4551542.pdf
    • http://briankstoner.net/uploads/1/3/1/3/131384254/2f0789b2.pdf
    • http://guildedstrumpet.com/uploads/1/3/1/1/131163733/gurekanajiwum-sewatobano.pdf
    • http://gyse.org/uploads/1/3/0/9/130969462/55a4175.pdf
    • http://westeastconnection.com/uploads/1/3/1/1/131164471/pivakoni.pdf
    • http://takeawalkinthewoods.com/uploads/1/3/0/6/130604858/nodijodof-zevufobesaluta.pdf
    • http://mycovesolutions.com/uploads/1/3/0/2/130289256/6eff16ff7.pdf
    • http://prcrf.org/uploads/1/3/1/4/131452872/xikinorobiminiliwotu.pdf
    • http://lashhousebar.com/uploads/1/3/1/4/131453335/natono.pdf
    • http://morrowworldpost.com/uploads/1/3/0/5/130588509/2416891.pdf
    • http://cbwikia.com/uploads/1/3/1/1/131164043/xawutogefi-kakisew-jawomolixina-wozava.pdf
    • http://houserenovationextensions.com/uploads/1/3/0/8/130813965/gewujokajaf-sugugavoxugeni.pdf
    • http://newearthwarrior.org/uploads/1/3/0/9/130969776/2185195.pdf
    • http://wormwood101.tw/uploads/1/3/1/4/131407958/4314245.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_off00005788.bin
5c2f63a9690bd4b139ab0b3a78b8fffa2420023794e5875396a83be4551ce83e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5788 9468 bytes

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