Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef672c27ff15c1f8…

MALICIOUS

PDF

81.0 KB Created: 2021-04-16 11:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9bcbaa3805ea13f5ab530bbc9d3ff63 SHA-1: 5a260b6df2da59387eb20aa290fd45dad0f0e5cc SHA-256: ef672c27ff15c1f8943169b38315a488c4406a1d38b25c3ab6c51db73e7f0fa8
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and the PDF's structure suggest it is a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=what+does+604+mean+in+numerology
    • https://cdn-cms.f-static.net/uploads/4448545/normal_6015c335bb978.pdf
    • http://konovulibugu.iblogger.org/friendship_quotes_in_english_images.pdf
    • http://lofitner.buzz/12106765238tz9g1.pdf
    • https://cdn.sqhk.co/wexovezojab/hgjUgha/used_dry_ice_blasting_machine_for_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4496374/normal_5fd288f9327fa.pdf
    • https://cdn-cms.f-static.net/uploads/4413862/normal_6025e232b8b8b.pdf
    • https://cdn.sqhk.co/joxonorapa/eXFjavJ/nukazexagixudab.pdf
    • http://easybranding.org/kenmore_elite_washer_wont_turn_offnb8bl.pdf
    • http://vawifasu.22web.org/adverbs_worksheets_for_grade_6_with_answers.pdf
    • http://hotel-engels.ru/12_steps_acoa_workbookxqq1o.pdf
    • https://cdn.sqhk.co/tajaketo/heje0hj/73900691319.pdf
    • http://theboldpantsproject.com/carve_the_mark_2_veronica_roth2t0kh.pdf
    • http://fogarapisow.22web.org/viah_punjabi_song_pagalworld.pdf
    • http://maliwalilaz.22web.org/structure_of_plant_virus.pdf
    • https://static.s123-cdn-static.com/uploads/4425728/normal_5fe56ec68044e.pdf
    • https://cdn-cms.f-static.net/uploads/4381756/normal_6022827704951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vofolosozoz.epizy.com/security_operations_manager_jobs_melbourne.pdf
    • https://s3.amazonaws.com/lovomijelun/fmea_template.pdf
    • http://totofexux.epizy.com/brandon_grotesque-_black_font_free.pdf
    • https://s3.amazonaws.com/paropabaru/13017107330.pdf
    • http://pitikepaz.epizy.com/how_much_oil_does_a_5.5_briggs_and_stratton_engine_take.pdf
    • http://zusirana.rf.gd/goxakejawirunakiwazepiza.pdf
    • https://s3.amazonaws.com/gezetega/splatter_brush_photoshop_cs6.pdf
    • http://parijuxurumemew.epizy.com/fukejomik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb71.bin
a89f62307fe1b7ddb4692765225a7659b74427a1662e1980a44c43dccdcfc5b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 5740 bytes
font_01_sfnt_off00010ee3.bin
3c439cc9434db51b98683ddbb4a81b4e4d3ef24c9d9a1ae2493a1a0f35448f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 11568 bytes

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