Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d65d66cbc63bd59…

MALICIOUS

PDF

40.5 KB Created: 2020-05-22 00:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89626d79be07daa2d6fd2bf130b2d369 SHA-1: 7c323c5b65716244fc8995fc724622b550d13727 SHA-256: 0d65d66cbc63bd593e8ceaf8be4fb6a7b26be64f3109ccd23877f79f6027c855
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external URLs, many of which point to other PDF files hosted on unrelated domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to direct users to potentially harmful resources.

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://3e0.undesirable.us/uploads/1/3/0/5/130589427/130589427.html#a+sense+of+direction+william+ball
    • http://brenbranding.com/uploads/1/3/1/3/131379792/8683040.pdf
    • http://infodeg.net/uploads/1/3/1/3/131380582/052d2d8.pdf
    • http://fryburgmarblemayfest.com/uploads/1/3/0/7/130776257/4d837f35.pdf
    • http://laurenmawhinney.com/uploads/1/3/0/5/130588291/5728c4a684e1f.pdf
    • http://rehabilitationmanagement.net/uploads/1/3/0/6/130603682/zewaruvafewew_vegol.pdf
    • http://energyselectrecruitment.net/uploads/1/3/0/7/130775047/aefaf.pdf
    • http://edtechjunkie.com/uploads/1/3/1/3/131383770/pezexazem.pdf
    • http://timetotalkart.com/uploads/1/3/0/5/130588434/xunarulogenopug.pdf
    • http://choustonfitness.com/uploads/1/3/1/0/131070168/4654214.pdf
    • http://willemjakobs.com/uploads/1/3/0/6/130604222/8170f.pdf
    • http://limestonevetclinic.com/uploads/1/3/0/4/130436242/lopofe.pdf
    • http://terranostralands.com/uploads/1/3/0/7/130740357/gekilanu.pdf
    • http://veraconsultingstaffing.com/uploads/1/3/0/4/130483041/0d94095.pdf
    • http://vanity-fire.org/uploads/1/3/0/4/130489054/1574360.pdf
    • http://macedoniasoulwinningchurch.org/uploads/1/3/1/4/131453934/guwigujamogipi-gituvu-nudozoxuseseru.pdf
    • http://wrightelectrics.com/uploads/1/3/1/6/131637430/zinikonex-namenotijik.pdf
    • http://demystifydating.com/uploads/1/3/0/7/130775723/tetoradakudez.pdf
    • http://siga.kz/uploads/1/3/0/3/130379063/08d533.pdf
    • http://dokeylawoffices.com/uploads/1/3/1/4/131437885/8252087.pdf
    • http://sabertruthtiger.com/uploads/1/3/0/3/130323174/betisoguk.pdf
    • http://tiffanyjsellers.com/uploads/1/3/1/6/131606598/xivunaxik.pdf
    • http://nohomoprod.com/uploads/1/3/0/3/130379315/e3a086ad94e72.pdf
    • http://sf-cm.com/uploads/1/3/0/5/130551184/7218296.pdf
    • http://willemdenboer.nl/uploads/1/3/1/4/131438464/vesitaforigegijadepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070d2.bin
d84035795f77f2dcc8233380a8f74ee1a13cd33fc41f36a984474ec54f8a3311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D2 10828 bytes

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