Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c238918a6d98d4…

MALICIOUS

PDF

89.7 KB Created: 2021-03-25 16:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52140b69bf400914f49f65db2e22221 SHA-1: 763ae6da9120e833efd321588407d6c70d03aa8b SHA-256: 87c238918a6d98d416e1a8151ce59af7bdace2875d44d8d0a9a12431e2bf687b
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, suggesting an attempt to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://kuzutuzo.ru/wix?keyword=burley+solo+manual
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/3581716.pdf
    • https://xulisonifob.weebly.com/uploads/1/3/2/6/132695361/6697947.pdf
    • https://cdn.sqhk.co/sovajepuxe/idHhjlu/bubble_tea_emoji_twitter.pdf
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/susiw_nuzipelosipom_gijupawa_xapulemep.pdf
    • https://cdn-cms.f-static.net/uploads/4470843/normal_604f1dfd57ff6.pdf
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/mimewo-kikalabejawade-xavomi-pubuxodafaxiki.pdf
    • https://cdn.sqhk.co/numisezopo/jEigFeR/kusigejisaruzupebet.pdf
    • https://cdn-cms.f-static.net/uploads/4420238/normal_603e8ee51d311.pdf
    • https://cdn-cms.f-static.net/uploads/4409992/normal_6055084548802.pdf
    • https://rerigexoz.weebly.com/uploads/1/3/4/5/134510817/f01a7.pdf
    • https://cdn.sqhk.co/woledowo/P1yMhaL/sound_blaster_equalizer_settings.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nitatotol/6167597174.pdf
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_84618e228c7549cf8aa2756b11fa095e.pdf?index=true
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_67eaceff1a8840c68af74b0444a58c91.pdf?index=true
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_a7cbb8b46b834090a9604629d312bc7d.pdf?index=true
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_79c18896ff644ae48cd95c72777e21de.pdf?index=true
    • https://s3.amazonaws.com/vuterijoze/free_poem_comprehension_worksheets_for_grade_4.pdf
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_18dde0128fa94c6c9eef7646ca925c7e.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff24.bin
3724abe7a7877e6b44928f80b34c812732bc182461085f8953c7a27035dc445a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 4736 bytes
font_01_sfnt_off00010f1d.bin
d6d4b4d52cfed9e7fe97df4c948cf61d2484bbf5f53c468087514ac8f3c7ea5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 11644 bytes
font_02_sfnt_off000136c8.bin
a56dd6e3cfa148c92ed5f3142193374b407f6958f728d0c91ff19ef246bd70d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C8 16084 bytes
font_03_sfnt_off00014b77.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B77 4324 bytes

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