Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb499f44a96bb9e2…

MALICIOUS

PDF

82.7 KB Created: 2021-02-10 00:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0e37469ecfc68e274540802e6d2066d8 SHA-1: f86d69285ff71badf201220311bfeb2e1eb2c38c SHA-256: bb499f44a96bb9e231e6a6491413f28a621136e8955fde40c1b54022964ae943
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to harmful sites.

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://jacksth.ru/wb?keyword=corruption%20of%20champions%20ember%20guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479439/normal_60116e93edabd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420036/normal_5ffabdb64849b.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/LSRgjVI/39611146613.pdfIn PDF document text
    • http://falutaburifa.iblogger.org/dg_application_template.pdfIn PDF document text
    • http://whysmall.space/how_to_think_when_you_draw_with_lorerxqmj.pdfIn PDF document text
    • http://bilapak.66ghz.com/30374454720.pdfIn PDF document text
    • http://zarabotok.space/reported_speech_exercises_for_class_10_with_answersvmigi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461511/normal_5fdff48942d03.pdfIn PDF document text
    • http://1freedom.space/zitaxepinapunemasul6m8sq.pdfIn PDF document text
    • http://zonetufe.iblogger.org/25408455620.pdfIn PDF document text
    • http://trokot-roznica.xyz/maxinaxadudadopewenokosi61owy.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/rufusalapadepudo38lsp.pdfIn PDF document text
    • https://cdn.sqhk.co/doxelatofon/8jhjcge/custom_design_flat_pack_furniture.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446647/normal_5fcf704383768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muwadobekele.rf.gd/gixabanaramovabu.pdfIn PDF document text
    • http://nozumipoz.epizy.com/pixewerojekomefizat.pdfIn PDF document text
    • http://dodemupisam.epizy.com/cellulitis_pediatrics.pdfIn PDF document text
    • http://tositasi.epizy.com/gcu_lesson_plan_template_example.pdfIn PDF document text
    • http://retexibew.rf.gd/scientific_notation_chemistry_if8766_answer_key.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_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 5584 bytes
SHA-256: ef7bea1b08b00a422c7332de77f99f1c98a82f3f3512b8ed3366e4a430f0994b
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 11812 bytes
SHA-256: c353b6c0ce2e873176a893a0300fd19b881fcf2dcd9e5c135655e48cce5f34f9

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