Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb904a838b3329a…

MALICIOUS

PDF

76.7 KB Created: 2021-03-05 16:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b92620213d2fb6dfcd86339bdd5ce8aa SHA-1: e442da4e5cf20b372d552b42cb8c9dcf2bf1abf6 SHA-256: cfb904a838b3329a590eaedd2e3739256cbdb525c1e901ec38b77df755d7bb27
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to replacing Oral-B toothbrush batteries, directing users to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=how+to+replace+batteries+on+oral+b+toothbrush PDF link annotation
    • https://cdn.sqhk.co/wisewuguv/jitCgf6/rezoxinanov.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/ghNnyhf/eos_arrow_gold_review.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/qiGgfgi/epson_iprint_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/nKmhcgf/duck_shooting_carnival_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ff1adaa0001f.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/6nOogc0/fogeg.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/ghigjf9/singing_bowl_meditation_benefits.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/john_deere_272_grooming_mower_parts_list.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/rabbit_digging_holes_in_yard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fdc4ebd1e413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_6016de6f7007e.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/jjbSkLB/82231056246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5ffc855ae8f55.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/fuY1gfm/dipovapilukubavemix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lilivuxaja.rf.gd/short_adventure_stories_in_english_for_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/free_felt_board_stories_templates.pdfIn PDF document text
    • http://positajugopisu.myartsonline.com/siduvefevaferanewebitute.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/xizefifaxufak.pdfIn PDF document text
    • http://sojetabusat.rf.gd/botabetuzubirowekexar.pdfIn PDF document text
    • http://pujumek.myartsonline.com/divemog.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/nikon_af_s_dx_nikkor_35mm_f_1.8_g_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/information_about_indian_navy_job.pdfIn PDF document text
    • http://bameganaguje.rf.gd/present_simple_and_present_progressive_exercises_online.pdfIn PDF document text
    • http://sebilazog.rf.gd/93580365843.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/lopawuko.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_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 5212 bytes
SHA-256: e3e0258e65356ddaafbcdc7055bee838138a45cc58e55aeafee82af89a4a9e69
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 10940 bytes
SHA-256: a6830321861e1cbb574a235abb041fd37074f6f0bff9496e474b30f72f6a5dfc

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