Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d595baf65e2e72…

MALICIOUS

PDF

67.0 KB Created: 2020-12-05 17:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e4b76400b6a3f2ca258652192031a000 SHA-1: 1b964044a0aaa2862c9cb3baf1a0f600611e6747 SHA-256: f4d595baf65e2e720938c2e1d9f819545ce8a86d9f7448fc0a3f4ebb086f1258
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, contains text suggesting a lure related to 'shoulder bursitis treatment', which is likely a pretext to encourage clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/aws?utm_term=shoulder+bursitis+treatment+pdf In PDF document text
    • https://dojumavuj.weebly.com/uploads/1/3/3/9/133997280/1071575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0ae29d7936484055b4e8/1606290146860/personajes_del_principito.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc550135bcb0228a29fc239/t/5fc987282f5dbb44b77244d9/1607042857813/mapewugazi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b305116eb00e3c6cd0a6/t/5fc761685060c93fcd7ceedb/1606902124899/wwe_news_undertaker_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/64066120470.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/anticoagulant_prophylaxis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/nujukufidebepijakev.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/wozuvijisufa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe19673485235c868d5b86/1606293863736/doritos_baby_commercial_plane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/757cd295-a401-46aa-8cea-3cfd32e51d5e/extreme_rapid_fat_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bae5168-648d-42e5-935a-194a658a0f99/16447216638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f416ea4-7814-4559-95fd-8df79f0aa10a/39543099969.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ed1560f2895dc1e7fe11/t/5fc291544f98375720333a77/1606586708608/unanimous_consent_agreement_define.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64d6d2e537a05ef2dd678/t/5fc82831970db930d9b60464/1606953011735/96149078332.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_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 5524 bytes
SHA-256: 7c9bbf8a7d09995b43701fb133b9c98e7c43c27ce13b5d737655a70edb383ee7
font_01_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 9764 bytes
SHA-256: 85ff562dc028052530d3d10e7315341c68a04ad489d35b3f9cd1552e90fc725f

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