Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85da885ff826710…

MALICIOUS

PDF

73.1 KB Created: 2020-12-16 08:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee41b324bcdff5e242370545f080095d SHA-1: 7901b833fc4dec3a2436fbd2f5961637feaa080e SHA-256: a85da885ff82671076debbd2a489b83f39004ace9940d3aa5d0edd3512dfed6b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains references to 'crab soccer rules' and the authoring application 'wkhtmltopdf', suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://trafffe.ru/strik?utm_term=crab+soccer+rules
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f8de0eb45bda.pdf
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5f95193e76bf6.pdf
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fc14e77885ec.pdf
    • https://cdn-cms.f-static.net/uploads/4411700/normal_5f9acd14866d0.pdf
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5fb7f788682c2.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f951d90d3f2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/466f8027-71ea-45f1-9700-22bcdf0d8438/grace_christian_center_online.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfbd5d334513fae421480/1606220759100/zupaxim.pdf
    • https://static1.squarespace.com/static/5fc0e2fd6b97992eb55c026f/t/5fc361593f75b166433f9358/1606639961918/85960884510.pdf
    • https://uploads.strikinglycdn.com/files/2ea98051-2650-4182-ab1b-58d01f2f86e2/kuzexuzitiziguxusi.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1e9b9b7bfd15107caaed/1606229660433/gukalopiso.pdf
    • https://static1.squarespace.com/static/5fc115bd5e8e827d428ee316/t/5fc3bbb5fa04221c7191f3bc/1606663094279/vapowenigesiroxuwokutak.pdf
    • https://static1.squarespace.com/static/5fc592a72e34347c706420e1/t/5fce128ca87f9f1b19002674/1607340684618/zombie_attack_2020_movie.pdf
    • https://static1.squarespace.com/static/5fc2b9efbdb33045eece00d9/t/5fd046c848ae4d1218fc8f13/1607485129131/89459462483.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfe.bin
2213d2e763f68544ea4a32185a462b3aa50c32968c0458010578d8fe3b9c8361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 4836 bytes
font_01_sfnt_off0000de75.bin
ef3940d821127e960044d79f2f3fa9301757b8baa0b891b15d791e93f22b9c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 10464 bytes
font_02_sfnt_off00010287.bin
e3a3a5380d44fb166236a7bf4258efad6d7c864eb73799346a4069400c658191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 16144 bytes

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