Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a62c6fed76c09ab…

MALICIOUS

PDF

87.2 KB Created: 2021-04-07 06:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a43224bf30e1742b7ff15b77e852790 SHA-1: 412d8accdfd35937ed66db206d7accb73f68fcee SHA-256: 3a62c6fed76c09ab24521ebc7a45c17de25744552549a9894e27379e8f5313e6
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a malicious payload or redirect to a phishing page. The document body, though heavily obfuscated, contains keywords that suggest a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=because+someone+i+love+has+cancer+pdf
    • http://poxexududojal.66ghz.com/rekanawineridunam.pdf
    • https://cdn-cms.f-static.net/uploads/4482207/normal_6060056922613.pdf
    • http://tajavimisafom.22web.org/book_report_sample_college.pdf
    • https://cdn-cms.f-static.net/uploads/4453553/normal_5fd3120a1e8d3.pdf
    • https://cdn-cms.f-static.net/uploads/4450356/normal_6021bb1a1929e.pdf
    • http://ninuwekevap.scienceontheweb.net/cual_es_el_proceso_de_investigacion_cualitativa.pdf
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ff3a5be701ea.pdf
    • https://cdn-cms.f-static.net/uploads/4450625/normal_601f21f4e4ad0.pdf
    • http://werikipirojenob.scienceontheweb.net/jejez.pdf
    • https://cdn-cms.f-static.net/uploads/4455669/normal_6025933f4e9e1.pdf
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5ff14ef84c574.pdf
    • https://static.s123-cdn-static.com/uploads/4448545/normal_5fde588ed695d.pdf
    • https://cdn-cms.f-static.net/uploads/4454694/normal_603236465d2e8.pdf
    • https://static.s123-cdn-static.com/uploads/4379220/normal_60072e1352166.pdf
    • https://cdn-cms.f-static.net/uploads/4375525/normal_604818b75409b.pdf
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5fda52a255ab2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mokuwanibof/mathematics_grade_7.pdf
    • https://s3.amazonaws.com/kudowo/35774707524.pdf
    • https://s3.amazonaws.com/viromibukoleliw/cash_flow_statement_direct_method_format.pdf
    • http://guguroguki.rf.gd/limitations_of_1st_law_of_thermodynamics.pdf
    • http://tekaxebabix.epizy.com/pl_sql_tutorials_point.pdf
    • https://s3.amazonaws.com/jezekemunidup/77647108077.pdf
    • https://s3.amazonaws.com/fajeloninesitel/75529391114.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b59.bin
841f06cba4ac891742a2b48d56a62a5a94bdc214556b2df0a8f93c2c0a76dad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 5304 bytes
font_01_sfnt_off00011d2d.bin
267408a7ed29249b8cead56e261e6b0a5fa4f6afa4b01ef0d3af86a87ff4d1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 10784 bytes
font_02_sfnt_off00014124.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14124 4324 bytes

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