Malicious PDF — malware analysis report

Static analysis result for SHA-256 5654456177a21546…

MALICIOUS

PDF

88.2 KB Created: 2021-05-01 02:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd8bae8a40f8b8acdfc03c796c24eb74 SHA-1: ac3050649e254ec2d566833c603bc038e0f1498b SHA-256: 5654456177a21546f943a19905a7fea2ae1aa8be6cf3a3fa6b69df6dd07458cf
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 as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL pointing to zajinet.ru. This suggests an attempt to drive traffic to malicious or deceptive websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=online+basic+computer+training+for+seniors
    • https://cdn.sqhk.co/bexamajuw/wCgfhja/45853830600.pdf
    • https://cdn-cms.f-static.net/uploads/4445880/normal_6033d7f68f307.pdf
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6059ea6e839ab.pdf
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5fcb20dc903c1.pdf
    • https://cdn-cms.f-static.net/uploads/4451210/normal_5fe6da8d864c5.pdf
    • https://cdn.sqhk.co/firavibaw/ahejfo4/51869758070.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_605040e514dd4.pdf
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5feff46bc0b53.pdf
    • https://static.s123-cdn-static.com/uploads/4477892/normal_5fc798f7e22f0.pdf
    • https://cdn.sqhk.co/mirusopujame/e7kcyjg/zelepaso.pdf
    • https://cdn-cms.f-static.net/uploads/4473622/normal_5fd6780138763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gixirojozogufux/free_minimalist_powerpoint_template.pdf
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_d753f5a8dbbe4fceb75b16f4ef349219.pdf?index=true
    • https://s3.amazonaws.com/muvarelo/bissell_proheat_advanced_carpet_cleaner_manual.pdf
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_58e8925d36e64838ab07c62b6f2c12c3.pdf?index=true
    • https://s3.amazonaws.com/wezukep/siemens_thermostat_controls.pdf
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_b0aea71772834dec9e4c6c633e5cf9fa.pdf?index=true
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_cc21affe52574555939cb45cfc1dc871.pdf?index=true
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_ca7fe03abf354b9891f8689f811e6244.pdf?index=true
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_14454f08ef854117a815ac362611383c.pdf?index=true
    • https://s3.amazonaws.com/vobuturinivi/is_dunkin_cold_brew_keto_friendly.pdf
    • https://s3.amazonaws.com/dovulavavo/chhichhore_movie_songs_ringtone.pdf
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_9402d184bb4542b09bec711f249cc42e.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_off000119cd.bin
01a7f413a198311536facc3173fd0ed4ffeb40e0f517d6e59a3ed4e8ef1b030a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 5504 bytes
font_01_sfnt_off00012c65.bin
c54535f32302035aca0a0782d36a6f57bc637f6b2ad93b296f733ccab23b28d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 11264 bytes

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