Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f36b2028e33332…

MALICIOUS

PDF

84.0 KB Created: 2021-04-06 15:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a3e6cd7e86c9d31bb793cb9eb620ba0c SHA-1: 2cb235a2ad9ca67aef4c9071a9f92c9252a53187 SHA-256: e5f36b2028e333326e86d8029164c19733c16185a83304b27b6d762d4a85fa9b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no clear user-facing text. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=plural+nouns+worksheets+for+grade+2+pdf PDF link annotation
    • https://cdn.sqhk.co/gizafimode/jjepQja/freeze_pipe_bong_review.pdfIn PDF document text
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/mevilogafepak_taxajuxodinolum_xapanivarab_favizunenanoj.pdfIn PDF document text
    • http://loxupudo.iblogger.org/nordictrack_commercial_1750_treadmill_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_604066c246858.pdfIn PDF document text
    • http://shoop-ff.ru/powerbass_asa_1500._1r88oh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_6021ae2f1c649.pdfIn PDF document text
    • http://kmikaerfs.ru/theological_terms4fes2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fd7fac7edc19.pdfIn PDF document text
    • http://womenita.fun/87933570478ssnl6.pdfIn PDF document text
    • http://matalake.22web.org/12864398493.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/0f05460cca0.pdfIn PDF document text
    • http://joteruraxa.22web.org/82578827892.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/ggjbggS/zombie_diary_2_mod_apk_cheat.pdfIn PDF document text
    • http://dle-tpl.site/giwubajamolafixodibi52lp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_60602a73a8fde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8d0933-f2bf-4ce7-911b-6ad93f3c728f/jupedukesadagirufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb47494f-69ce-4097-91b6-6f9f6ca8369e/www_usps_gov_email_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c43371b-af52-4f66-8a24-83783fbddc64/genesis_37_esv_bible_gateway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9f0236-c3b0-4a0f-9794-b06cbf9b332c/ganosupax.pdfIn PDF document text
    • http://jexuzutipeku.epizy.com/agarose_gel_electrophoresis_procedure.pdfIn PDF document text
    • http://gufolisalowu.rf.gd/81170975171.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_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 5592 bytes
SHA-256: d29521d93c862f0380dcd6691593fc4f561e645994566b0f7b9d8e2e95b78c1c
font_01_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 10680 bytes
SHA-256: 6b5901764e6db2df23177429aa672e58307a7a3aa3fcb5ffe7fd7215c04ebca6

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