Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3f9301542f8617…

MALICIOUS

PDF

78.2 KB Created: 2021-04-19 19:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 27b4958b7f418bbb735886ffa7c1ec5e SHA-1: 75c83e8993d8114a7c501ecfdaed5ffb00697227 SHA-256: 3a3f9301542f8617b54678518da91adb47cd1ddf11aa8a82def35d2c39943a69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('seumenha.ru') and using a 'utm_term' parameter that suggests a lure. Heuristics indicate the PDF is part of a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely phishing or a trojan. The document body, though heavily obfuscated, contains metadata related to the 'Tascam dr-100 mk3 review' and the authoring application, suggesting a deceptive pretext.

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://seumenha.ru/strik?utm_term=tascam+dr-100+mk3+review PDF link annotation
    • http://vudujupuboneg.22web.org/55672948189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_60663d9786e86.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/breville_toaster_oven_bov650xl_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5fe1ec4617ebe.pdfIn PDF document text
    • http://vitezozikupu.iblogger.org/el_llano_en_llamas_resumen_de_los_17_capitulos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_601039ddd7413.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/5078391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_605070775d455.pdfIn PDF document text
    • http://reduslim-italy.site/9453608070760mv.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/xesuz.pdfIn PDF document text
    • http://zobowinizigimef.22web.org/64584422998.pdfIn PDF document text
    • http://circulyarkadigital.xyz/edexcel_igcse_economics_student_book_answerso1jac.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/e0e9ed.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/vupejujulit.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/lapadapozijalel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesesasogibigaw.rf.gd/classroom_management_strategies_for_elementary.pdfIn PDF document text
    • http://xodubepegiluli.rf.gd/fuxilagajelotemafuba.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/jiwusinusosatanosaterev.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/nidifosobutudava.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/31532109561.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_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 5608 bytes
SHA-256: 5d22c65ae0bbe17f16f2f10e0f5b597ae11fde3d97c55c251e8604a8cf4fafce
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 11724 bytes
SHA-256: b2ed6a017ce5264078d2c7fc46b7fd3a6ab81f8b40854925bfafd1cf04375694

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