Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7cc404f98d7b50…

MALICIOUS

PDF

77.2 KB Created: 2021-05-06 10:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99b14042c905ad26efe5dd275ec76380 SHA-1: d138590ef8fb74193460758c64e7b170904e5209 SHA-256: 6c7cc404f98d7b50588e73a13a558eeacd69c77f36fc5e244a3d652ac9fcea72
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to potentially malicious or unknown domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=do+trampoline+parks+make+money
    • http://gesetaxoxu.sportsontheweb.net/kujelaxo.pdf
    • http://banuduxirodeb.mypressonline.com/alphazero_chess_games.pdf
    • http://regudak.iblogger.org/bejelofivewox.pdf
    • https://cdn.sqhk.co/leporolino/MTgjghR/39972059672.pdf
    • https://cdn.sqhk.co/dawadetugas/ghhfFhi/fisadadoguwusojowiwunu.pdf
    • https://cdn.sqhk.co/gutinisiv/OhbbheU/yummy_yummy_monster_shooter_game_online.pdf
    • https://cdn.sqhk.co/jumupebuvi/JIghigc/landmarks_of_the_world_puzzle.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/65f34ae2-d83c-4fbd-a86e-234e4adc739e/how_to_buy_a_mobile_home_in_canada.pdf
    • https://uploads.strikinglycdn.com/files/5e2b01d4-4c39-4cf9-b0b4-2910a3080fe7/john_c_maxwell_5_levels_of_leadership.pdf
    • http://jozazesebogole.rf.gd/glencoe_health_chapter_3_test_answers.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_f727a86a3d46474f876b91adf6dd5730.pdf?index=true
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_6f436b0f99e146dea0842ea4a28591a3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f6d3f3e-e4ab-45c6-8fbc-f3f8fc8f404b/why_did_my_bluetooth_speaker_stop_working.pdf
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_a1fd6f1aa4bf4c13899321fb95bcec23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3b02810-69f5-4eed-95fe-fff0d3765d63/tunum.pdf
    • https://uploads.strikinglycdn.com/files/2947436d-c729-4d1a-af6b-42305e58b6b7/california_adventure_map_2019.pdf
    • http://xubexiv.epizy.com/63608348185.pdf
    • http://belibivizonojo.myartsonline.com/anchor_bolts_types.pdf
    • https://uploads.strikinglycdn.com/files/65e804de-e664-4e04-b967-102f868de92d/vonuvo.pdf
    • http://naxesabefadufu.atwebpages.com/berenice_edgar_allan_poe_francais.pdf
    • http://milebulijulami.onlinewebshop.net/sogigidijibiripim.pdf
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_eb95056d8161468da58e42d304d64bba.pdf?index=true
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_344b2d4358854f268564834c53b8a301.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d88eb8e4-111e-478d-a4a1-9d7b73e6a9c6/bumowidagaluk.pdf
    • https://uploads.strikinglycdn.com/files/40252743-e865-4036-9054-7b7a04eaf9e1/5x5_workout_program_buff_dudes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f014.bin
2a8015ca164fa6b44d2249d4642de6c514d4fc620e4d7228f4d41f43fd8a36af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 5132 bytes
font_01_sfnt_off0001017f.bin
f9cd7ce542a13a1712fe92d59d195e864d278df83c47300d3095356d2d692414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 10536 bytes

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