Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cef66b3d39e988…

MALICIOUS

PDF

92.7 KB Created: 2021-03-03 11:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 906fa914fd46044cc75aeffddf227e2b SHA-1: 735f2c37192659b201181406e4802f5d4680907a SHA-256: c2cef66b3d39e98884062420260856b697e102521ab5b2567b0d3d339f94374f
126 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, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to 'games unblocked' and 'wkhtmltopdf', suggesting a lure to a website that likely hosts malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/wix?keyword=bowen+arrow+games+unblocked PDF link annotation
    • http://punejew.mygamesonline.org/define_clarion_call_wiki.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/lemuvapajawin.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/what_does_esv_study_bible_stand_for.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/8T0iahV/leap_day_game_characters.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/69537366558.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/how_to_improve_effectiveness_of_human_resource_management.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/2007_honda_rebel_250_horsepower.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/what_is_flowchart_explain_its_basic_symbols_with_an_example.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/how_many_books_are_there_in_total_in_the_catholic_bible.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
    • https://s3.amazonaws.com/duzexefemosaxe/tegijugokegoxalaguvumoja.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/what_type_of_wood_chips_to_use_in_masterbuilt_electric_smoker.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/3765264581.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/18335341989.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_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 5360 bytes
SHA-256: 0648d3d78c2a4e53f29aa31fd5c3de7696f66fd6f7974c6bbb1f8e9c33e51059
font_01_sfnt_off000133d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 10528 bytes
SHA-256: d124a5e949f90bcf134560f86d3bc01ccb167e90567805a3e2eb82d5c8ac20cc
font_02_sfnt_off000157d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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