Malicious PDF — malware analysis report

Static analysis result for SHA-256 79439527f6999a9c…

MALICIOUS

PDF

74.3 KB Created: 2021-04-05 15:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7972dae6297b48be98d095bd6c2182f SHA-1: 7a8ae15d363971333cb728a22d57bd5701655662 SHA-256: 79439527f6999a9c850edc91111e899fac942bb14577ebac5aff31a93ebfdf1e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF with a high ML classifier score and ClamAV detection indicating maliciousness. It contains an embedded URI pointing to 'fokemale.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'cool lego wallpapers hd free', aligning with a phishing pretext. The presence of embedded objects and the PDF structure suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=cool+lego+wallpapers+hd+free
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5fd7b60c5a4aa.pdf
    • http://gogotmif.space/clinical_pharmacology_and_therapeutics_bookbkkl1.pdf
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fdf912e56d7e.pdf
    • https://static.s123-cdn-static.com/uploads/4459936/normal_5fca67270e1a3.pdf
    • https://cdn-cms.f-static.net/uploads/4476566/normal_600c9cf485712.pdf
    • https://static.s123-cdn-static.com/uploads/4482426/normal_5ff962366a22a.pdf
    • https://static.s123-cdn-static.com/uploads/4500417/normal_5ffd6ad7de148.pdf
    • http://qrastenmap.online/free_esl_english_classes_for_adults_near_meutc30.pdf
    • https://cdn-cms.f-static.net/uploads/4489994/normal_60123622034bc.pdf
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd16f4ad9d08.pdf
    • http://nudistoff.club/lovetoboso3zqot.pdf
    • http://songkfrk.site/69678827559pkacl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ximitexus.epizy.com/78516580630.pdf
    • http://kegigija.atwebpages.com/26288932296.pdf
    • http://damokoz.epizy.com/kiros.pdf
    • http://wesovipimamino.epizy.com/6_month_probation_review_questions_and_answers.pdf
    • http://peledopa.myartsonline.com/bomitufoxobapijag.pdf
    • https://uploads.strikinglycdn.com/files/f4d2b934-f93c-40ba-9443-069cf6e3f6c2/basic_math_skills_assessment_printable.pdf
    • https://uploads.strikinglycdn.com/files/6591b385-5eaf-4d0c-bd07-037878667fcd/85437298921.pdf
    • https://uploads.strikinglycdn.com/files/bb170406-a77b-476b-a6a5-7c6e78cade23/lirozitugurabemovud.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63f.bin
37c22a18808423f25484f6a7e87b4e1746c1354cb8c0e698f12a54f68711c876
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 5300 bytes
font_01_sfnt_off0000f84e.bin
8064a7fda84a4cc1c3927244d50c790e1f0630fe36cb486ab66734fba30591d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 10328 bytes