Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f40be1d437ecaa…

MALICIOUS

PDF

83.6 KB Created: 2021-03-24 15:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9af135da34ea8b0af9456d0352b455a SHA-1: f06d4a63108309fe0d9e66df0a91b97fd55ef469 SHA-256: 20f40be1d437ecaafa43dbd34b27b0377a8b2a719488bacf95224354eca14c56
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, further supporting the phishing or malware lure scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=how+to+score+spm+english+paper+1
    • http://iclod.tech/who_is_the_antagonist_in_the_maze_runnerihx3x.pdf
    • http://instasurprise.online/maths_tricks_for_competitive_exams_in_marathifg78j.pdf
    • http://helpcopyright-service.com/76332065816zkfmz.pdf
    • https://cdn.sqhk.co/niwonosorude/hihjdMQ/warzone_bunker_codes_season_6_boneyard.pdf
    • http://kigurumi.org/kikekufep8n18j.pdf
    • https://cdn.sqhk.co/xejadukoxeta/jaXuja8/cake_designs_for_mens_30th_birthday.pdf
    • http://getplafond.xyz/254603926123701m.pdf
    • https://cdn.sqhk.co/vafodagusun/5KVi5hj/headhunter_io_mod_apk_android_1.pdf
    • https://cdn.sqhk.co/bedimiwojam/mEniaib/91477833850.pdf
    • http://idealicaitaly.site/9391836273584efk.pdf
    • http://erse.xyz/3051871507965rr9.pdf
    • https://cdn.sqhk.co/febenapox/KCjbcCv/jesaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gijufebevavudep.rf.gd/87930934312.pdf
    • https://uploads.strikinglycdn.com/files/ee3bf4bc-2cb6-426f-b1ba-ff0c19a1c573/social_security_payments_increase_for_2020.pdf
    • https://uploads.strikinglycdn.com/files/9f197573-e809-486a-8854-18fa4f791823/68216745769.pdf
    • https://uploads.strikinglycdn.com/files/4e3f6fe0-9945-43d8-b905-c4fc2f6f22a0/how_much_is_a_viking_36_range.pdf
    • http://lipisalozolujew.epizy.com/kaxekakotamenerevosaweko.pdf
    • http://xibiwoziveva.epizy.com/4661841813.pdf
    • http://fixobijuruloluk.rf.gd/google_authenticator_cho_pc.pdf
    • https://s3.amazonaws.com/miledu/65125039629.pdf
    • http://baponexar.epizy.com/sbi_card_elite.pdf
    • https://s3.amazonaws.com/legipalofi/89840747083.pdf
    • https://uploads.strikinglycdn.com/files/0b96bf32-86be-40cc-ac11-5ed0472fc2aa/11552358584.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67c.bin
e4250e2055b54bb66eda2844dba26547df0571c5f0ccdf49d6ada46154077f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 5452 bytes
font_01_sfnt_off0000f8ec.bin
72bc57c0457ebf7dc9739fec1cc54de770e15154677afaae4f6948469598440c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 2252 bytes
font_02_sfnt_off00010255.bin
6f43166a5f6175da9fcfcfc4d653ab2cb3b34ea071e80b2e0495a3aef222b195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 11200 bytes
font_03_sfnt_off000128e5.bin
6103880699c58c9dcbfb82c20001dce96598554c1b2c9af54e56605986aeaaf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 16756 bytes

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