Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5277ebd9f91147…

MALICIOUS

PDF

84.0 KB Created: 2021-03-19 17:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0dd526182700800a7b65184fdc444871 SHA-1: 029e4537dd727d25e97cd4e3a5b4da59a6310ca5 SHA-256: af5277ebd9f911472c33b68a6c630e3da88906bad4f4b6eeb31c71e4e2aadc55
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://jumiwimov.ru/wix?keyword=alpine+pdx-v9+plugs, suggest a lure to external sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate an attempt to redirect users to potentially malicious content.

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://jumiwimov.ru/wix?keyword=alpine+pdx-v9+plugs PDF link annotation
    • http://zesenadozefut.sportsontheweb.net/ledifezabemetifobawugaz.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/90783746830.pdfIn PDF document text
    • http://soldonlittleton.com/lekilunuferenuswqpu3.pdfIn PDF document text
    • http://segway-wheelchair.ru/speed_queen_washing_machine_prices_makrobpj4b.pdfIn PDF document text
    • http://joblanc.xyz/how_to_turn_off_seatbelt_alarm_ford_rangere9u2z.pdfIn PDF document text
    • http://ejqy.com/lorisiwaxolixrbw1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6012fc71daeaf.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/basketball_shooting_drills_for_high_school.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/sarutawupizidopifer.pdfIn PDF document text
    • http://jomufobi.iblogger.org/momafov.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/15686655444.pdfIn PDF document text
    • http://0fruits.space/yeast_fermentation_lab_report_introductionyirtx.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/gurodoxiwetekemaz.pdfIn PDF document text
    • http://dafesoxexigu.medianewsonline.com/63276817159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5ff0e8c22c8de.pdfIn PDF document text
    • http://zekabor.iblogger.org/moxulitot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wemaxoseni.myartsonline.com/modern_algebra_herstein.pdfIn PDF document text
    • http://doruzedom.epizy.com/java_application_architecture_modularity_patterns_with_examples.pdfIn PDF document text
    • http://pexevogawi.epizy.com/criss_cross_pattern_crossword_answer.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/cable_current_carrying_capacity.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 5124 bytes
SHA-256: f3399b8131206e6c69fc88e6f0d2580535dbc3eb201fd8b73c5e5d599ab37e70
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 14716 bytes
SHA-256: 053d8f63d1abc755a2f6854d084de15b01812f2dcc3b112d8c9cc98aa5d3a9ea
font_02_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

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