Malicious PDF — malware analysis report

Static analysis result for SHA-256 9291ab870cbd9fcf…

MALICIOUS

PDF

75.5 KB Created: 2021-03-25 11:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cd0a88e08c7b3bc678a79f578c383861 SHA-1: 5e28fb80714e358b5a57dc99d244370cc614a2d1 SHA-256: 9291ab870cbd9fcfb4eb832c884c4470f7aa8cb0c7b177a7171642b890019185
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicative of a link farm designed to obscure the final destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cdn.sqhk.co/wogirujut/fNDhg16/find_a_way_addictive_puzzle.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_600dcef5e70c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fffb092e3d81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465907/normal_5ffa1e426d91b.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/fojewepinivinapijitopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_6044f5d305940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_600be9319ec10.pdfIn PDF document text
    • http://xifasiv.getenjoyment.net/lofurugaribasutiwadom.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/Oiejfgc/muxamanepipatupibafijudos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_6059b1d97ddc4.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/Yjbhjd3/blue_dragon_wallpaper_hd_1080p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_6001ff964f125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458407/normal_5fdd64fad072e.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/Sjbgjjj/85769478757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_604e0e38bb124.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=logitech%20k120%20keyboard%20volume%20controlPDF link annotation
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_d1e06504b76e45deb39eb6601d29499a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/how_to_find_out_standard_enthalpy_change.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/chamberlain_liftmaster_professional_program_remote.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/xbox_360_codigo_de_erro_8015d000.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/arquitectura_barroca.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/gekalowepavef.pdfIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_d7607fceab7447a0a695cbe434745cd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/baby_groot_and_baby_yoda_rap_battle.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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 5808 bytes
SHA-256: a6bfc25a7bb1d9055c7ada7a918539d2cac5abd42c30f5ee31dbc1556f372810
font_01_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 11404 bytes
SHA-256: bf8b4c783fff633fe1ddeddc341c2c30728de9265d89ff2e593267646fd1e5e5