Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84fe87229e6b2f8…

MALICIOUS

PDF

74.4 KB Created: 2021-02-26 19:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: df3abee9ecea5e02382a16e275f23c32 SHA-1: 3682d215374c985045bba59bb9ef14099b6b5c01 SHA-256: b84fe87229e6b2f8209109fc93bf08ba5be1e6cc3fe6b04e7d26f42546515222
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, contains fragments suggesting it might be a lure for specific items or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=used+yaesu+ft+950+for+sale PDF link annotation
    • http://leledup.mypressonline.com/how_to_disassemble_a_bowflex_ultimate_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_601be45c54403.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/72449199619.pdfIn PDF document text
    • http://alifan.store/la_cancion_de_annier2e0q.pdfIn PDF document text
    • http://kprovk.xyz/kenmore_90_series_electric_dryer_not_heatingd0fnz.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/nixaremofokoxorerumugubu.pdfIn PDF document text
    • http://timelessdecorum.com/basic_math_assessment_printableh83hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5fdb02762b6d0.pdfIn PDF document text
    • http://znalomstvavip.site/dusiwugofl1aj1.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/how_to_minimize_and_maximize_windows_using_keyboard_shortcuts.pdfIn PDF document text
    • http://bluetea.space/26632453350b7yan.pdfIn PDF document text
    • http://ketrovk.xyz/brown_bear_brown_bear_printable_bookw548v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_602b0b1244d7b.pdfIn PDF document text
    • http://profyhouse.ru/cant_sign_into_chick_fil_a_appi9on4.pdfIn PDF document text
    • http://kostlike.site/amor_de_inviernon9was.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/the_game_awards_voting_results.pdfIn PDF document text
    • http://ch-redirect.icu/noxaxidukebusenoviv6gkd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500201/normal_5feb47e567d06.pdfIn PDF document text
    • http://appless.space/68395404796c6hem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/72091520083.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/total_quality_management_definition_tutor2u.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 5416 bytes
SHA-256: 99eb6456aa964d153505c0b0b555cc4d8bfbfa7eed4d4ac7c150ee8c7b90c00b
font_01_sfnt_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 12068 bytes
SHA-256: 57f0c31e215bf2414d15922a2e9cda303635b9db42120d3fb03b323fd19653d7

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