Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22535fadd56ad8b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 23:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c4253b85c67623fe760f625651efb717 SHA-1: b01dd6ecf9ce283ea5ca651e3cde789323c0c507 SHA-256: a22535fadd56ad8bc9318040685eea6d48ded13df2526d9186db581624bbe334
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several hosted on disposable domains and link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation or redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/123?utm_term=armored+core+for+answer+360+review PDF link annotation
    • https://cdn.sqhk.co/lebinezekoma/bLaQd4b/chocolate_bundt_cake_recipe_using_cake_mix.pdfIn PDF document text
    • http://amsidgi.xyz/mikinofivaxegerezefbixo1.pdfIn PDF document text
    • https://cdn.sqhk.co/xojugako/rdg9iaz/bafodavoba.pdfIn PDF document text
    • http://garant-ritual.online/tabla_de_integrales_indefinidas_o_inmediatastnobc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5fcdd0e3c576c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_605b6031de24e.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/ojdL8Pw/kyriad_hotel_disneyland_paris_booking._com.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/hc8gfje/train_snake_taxi_idle_sightseeing_ios_13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_60353e4d6893a.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/ghgieZk/xefigurozuv.pdfIn PDF document text
    • http://hookup756.fun/17276963045n9l1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_6047828e0b299.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/Kgdzjdv/gizojorinejugugexilam.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/ibthjgi/mountain_bike_off_road_gps.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/dWjeMpT/retro_cruiser_penny_board.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_603495a75d483.pdfIn PDF document text
    • http://mailedflkf.site/5649465990dv051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zidenigad/ford_555d_backhoe_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/rixiwez.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/spreadsheet_of_concrete_mix_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/close_to_the_sun_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/unravel_me_sabrina_claudio_lyrics.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/canada_post_lettermail_rates_2020.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/common_sig_codes.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_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 5736 bytes
SHA-256: dcb26b41d8d583b3fb8fd10e3f06f03c1af7a1cee9b9fc56909bf9b4f73b8170
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10300 bytes
SHA-256: eaf6b2862a2b2cf550917d30e9c0f7c42a95e6c44c80eb70ce86c4f3186c1e95