Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6891d81baf725be…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 13:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9d49ec5b1959aa057cbde3c6e88cc302 SHA-1: 12c9423d6ce9c5804b09d08f8ff3cdf371f3589d SHA-256: f6891d81baf725be19669915a395727b0b367730da9756902f2f137904f0447f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/wix?keyword=daniel+yi+xu+duke PDF link annotation
    • https://cdn.sqhk.co/safubuguva/zticbKt/air_combat_racing_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_5fea188038ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5fd86aa4613ba.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/37638789358.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/14049305477.pdfIn PDF document text
    • https://cdn.sqhk.co/wexapitode/R3hcjiQ/jojefudejopudomaz.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/Bje0Poy/guide_for_dream_winner_soccer_2020_hile_indir.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/iexjhjc/turenezos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jokosen.atwebpages.com/red_cards_in_joking_hazard.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/58315261565.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_84b463d0cca2444e92c0bb8a9ec7b4d1.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_5e2d7dc28c364ffa90ad997421249b42.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_b53691a2e15145f3a85c3b8a39d6b4f1.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_984680ead2224a1b941bc9ef8dd67a74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/2011_chevy_malibu_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/what_is_the_best_book_for_marketing.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/simple_java_projects_for_beginners_free.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_5aaae528be374fb098c4050fd41f07e9.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/arboretum_board_game_rules.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_caf87534209045afbd75526e0c312330.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_9735834c5551437cb378c60cfdcd0da2.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_1dacdea9d11b444a96289ec08a3fd56a.pdf?index=trueIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/febrile_neutropenia_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/free_easy_trumpet_sheet_music_printable.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 4468 bytes
SHA-256: e39eba2243f00aa47273b950b84367bcd192c1ef1a35d472b9858dd57b4a59cf
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10860 bytes
SHA-256: ef679958af73728fdcd6a81049d522e759ddc81800cb0fa9be898fef1f21fcde
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3