Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39569be0f6d5a5c…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 16:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 142126f343dcd356136e48e4f50c82ef SHA-1: c025a11bbf9da82ea6290abccd8d0bb4d96e9919 SHA-256: f39569be0f6d5a5cd242b62e98fbc075f310bd6ada9ca4e481dbb09ae53dd8c2
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The sample is a PDF file flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick the user into installing a fake browser update or extension. The embedded URL 'https://druttle.ru/award?keyword=entrepreneurship+journal+articles+pdf' is likely part of this lure, aiming to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://druttle.ru/award?keyword=entrepreneurship+journal+articles+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5fdaf9b07f60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_602e7a30c1c86.pdfIn PDF document text
    • http://keepsufi.space/61195635976dr3nz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5feea85f99530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5ffea4771d889.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_6001167a596f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_6036954c86b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5fe9b4d72b8e7.pdfIn PDF document text
    • https://cdn.sqhk.co/bepasasa/dMCcice/69282738348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_603e09049258c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420013/normal_5fde413af1120.pdfIn PDF document text
    • http://magicwoolshop.com/hearts_of_palm_pasta_keto_recipeybl7a.pdfIn PDF document text
    • http://pitushok.space/angularjs_interview_questions_and_answers_githubfygkt.pdfIn PDF document text
    • http://jushq.pro/71292858546ybw4u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_6056aace7f6be.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/gh7THyX/real_baseball_3d_mod_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 5276 bytes
SHA-256: 32399f6079f07219a6d063371afc03c81cfc6e865a8cf103516ab12018169693
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 11772 bytes
SHA-256: 62e01f1271e12771388c2f230f8b501fba5f2e6ce6a2a3dbd9f719549b190e70

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