Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b2af92111fae45…

MALICIOUS

PDF

82.4 KB Created: 2021-04-06 19:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5041a9ded6881f76dad03bdc6b25dc5b SHA-1: 4eced07bd93b34520ef92752241389ef8532cdfd SHA-256: c8b2af92111fae4570315e4767619f19f683f69c2846838bd3a2953697aeb5d3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and distributing malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many external URLs, including one pointing to 'zajinet.ru', strongly suggest a malicious intent to redirect users. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=ejercicios+gramatica+espa%25C3%25B1ola+b1+pdf
    • http://konalofasu.mywebcommunity.org/76335812775.pdf
    • http://tejidirexe.mywebcommunity.org/6th_grade_math_staar_practice_test.pdf
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/450df0a9c9d0c.pdf
    • https://cdn.sqhk.co/radofufalam/DTkF8ib/final_fantasy_crystal_chronicles_remastered_physical_copy_english.pdf
    • https://cdn.sqhk.co/reriwoduriju/ggcu3rX/robotics_notes_anime_review.pdf
    • https://cdn.sqhk.co/xubulozirod/ezjbHib/minecraft_adventure_parkour_server.pdf
    • https://cdn.sqhk.co/kapapomabu/aJififJ/91085218690.pdf
    • https://cdn.sqhk.co/jabosuve/haQxrgi/digi_1_head_office_contact_number.pdf
    • https://musagitunoton.weebly.com/uploads/1/3/4/3/134368320/zabakibage.pdf
    • https://seritixatot.weebly.com/uploads/1/3/1/0/131070849/527a0c03f9.pdf
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/1609502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d8cefaa4-4a05-4de5-862a-0848ad7b4ccc/11207892196.pdf
    • http://benamow.myartsonline.com/64276150714.pdf
    • https://s3.amazonaws.com/zevutebulaworel/bedumokemapima.pdf
    • https://uploads.strikinglycdn.com/files/e1ad9d27-35fd-47d5-a662-30181b31a69b/99559311895.pdf
    • https://uploads.strikinglycdn.com/files/15e1811e-3772-4f8c-9cd6-995be2a75d8e/2002_ford_ranger_4.0_towing_capacity.pdf
    • https://uploads.strikinglycdn.com/files/9903856f-249c-40bd-b7d5-2aeddbc67c24/16622196176.pdf
    • https://uploads.strikinglycdn.com/files/e1eb97d7-38e4-467e-a7aa-562cb632d9f1/kafunejurotixasadilizusew.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/kurugixesidebifepisab.pdf
    • http://lafagelupuf.myartsonline.com/logical_and_physical_design.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/student_information_card_template_for_teachers.pdf
    • https://uploads.strikinglycdn.com/files/d258478a-dadf-4c50-90d2-3c3594aa84d4/jojuj.pdf
    • https://uploads.strikinglycdn.com/files/161bc45d-e0d2-483d-b577-262f38c6882c/95983858253.pdf
    • https://s3.amazonaws.com/fewifuwu/purizukafeginedapabijib.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_off0000e8a0.bin
a1604bfab945ada47cd5d8ab8cd981b6bcf333e7a1f3773144ba492e42774846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 5912 bytes
font_01_sfnt_off0000fc75.bin
0c5855126c958e0c08101839a7596563230ea5aaecd666362fb0a612ef2076ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 11996 bytes
font_02_sfnt_off000123d8.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 16312 bytes

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