Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a12d66b43f27d97…

MALICIOUS

PDF

77.3 KB Created: 2021-03-21 04:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee15e87b951d8b21e3a6c3eb9d90cc89 SHA-1: 2a2b1999735f0b527e95e23ea60809babfa1df68 SHA-256: 0a12d66b43f27d971049f29b3f60532ac35ee5c13dccb5180a2dc228d70789fb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, contains references to external content, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=the+giver+book+chapter+1+summary
    • https://cdn.sqhk.co/manuguwe/ifu3TVm/samsung_galaxy_xcover_4s_enterprise_edition_review.pdf
    • https://dopilefuma.weebly.com/uploads/1/3/4/7/134733068/59e54b00aa223.pdf
    • https://cdn-cms.f-static.net/uploads/4478146/normal_60384eab59d6c.pdf
    • http://aduo5.online/nfl_schedule_week_5_byeg2ory.pdf
    • https://wozexofinudere.weebly.com/uploads/1/3/5/9/135984457/1714186.pdf
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5ff1bb62de8e1.pdf
    • https://cdn-cms.f-static.net/uploads/4443803/normal_603b008297d32.pdf
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/ropuke.pdf
    • https://rizozupobaze.weebly.com/uploads/1/3/4/3/134331191/ff51a673f732385.pdf
    • https://cdn.sqhk.co/suxujaba/ggrORLl/lucky_car_dealership_monticello_ar.pdf
    • https://cdn-cms.f-static.net/uploads/4447098/normal_6055161f309ec.pdf
    • http://natlab.ru/defalonixenaserozivuvind54zt.pdf
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/sivulomofepibu.pdf
    • http://chambrehq.xyz/vagomud51bgf.pdf
    • https://cdn.sqhk.co/zogobadakedu/jKhhGJR/radio_online_usa_news.pdf
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/vebojajofijam-zonefo-lajumefanid.pdf
    • https://tuxemadoja.weebly.com/uploads/1/3/2/7/132712185/881b6b6b1a4fbfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_fd8aa1f6842e41efa364cf96d58eaa0c.pdf?index=true
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_9a9ac91639884d8698016d168d9fadd3.pdf?index=true
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_a0ecffdafde3433eba8026ff7081e535.pdf?index=true
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_dda0318a8c59472e8cc2d465bed8da5a.pdf?index=true
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_27854680e03c4a77baedde49e4bb2738.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee64.bin
97033ecb6bc100859b2615fd57226a90dadfede53360050122c188cb45082e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 5680 bytes
font_01_sfnt_off000101a7.bin
7e494f96bbf1e9c57f9cceeb70d42000da8799f3f286c74058846a4611d9fbc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 11312 bytes

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