Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ea974d32e715eb…

MALICIOUS

PDF

73.0 KB Created: 2021-04-03 11:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bddc2f9005d97a7ef08ee90523a668d9 SHA-1: a05c678c1c302734ebe3615c7520da276b723210 SHA-256: 98ea974d32e715ebf90633099c5832e8eab0bfd428f26500038bd53d1869cf14
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains an embedded URI pointing to a suspicious domain, mezovuduw.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be related to the URL's keyword, suggesting a lure to a fake educational resource or similar scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=br%25C3%25BCche+umwandeln+%25C3%25BCbungen+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449421/normal_603630a7ae121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_6032614d3b799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_6050991ef370b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_601e59d12c032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_6067dc1396f4c.pdfIn PDF document text
    • http://dazomasuw.22web.org/editable_cv_templates_free_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_6013dc2eb2458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492871/normal_6003730cc4f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_60325bec4fa3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_5fe25a535cfdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_6062cb9daef40.pdfIn PDF document text
    • http://goxuvux.22web.org/86936583598.pdfIn PDF document text
    • http://jazeforip.22web.org/gigonibotozavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/how_did_betty_g_miller_became_famous.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/reading_comprehension_worksheets_with_questions_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/jakelakumided.pdfIn PDF document text
    • http://durunorutap.epizy.com/41798264760.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/allahabad_high_court_aro_paper.pdfIn PDF document text
    • http://tizidirek.rf.gd/verevonose.pdfIn PDF document text
    • http://vibejasejejake.epizy.com/43714098343.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/brobar_boli_nimrat_khaira_song.pdfIn PDF document text
    • http://piwelipad.rf.gd/4791227002.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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 5792 bytes
SHA-256: 9072bd7b3784c3c7f9f2376e567a3be3a1c9ba04934aa220c7d6aa9f734008a6
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 11328 bytes
SHA-256: bb3324132fb1d10840218f3366a541e892469edcc6cc155889af7604f31e3da9

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