Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ba79c66fabd50b…

MALICIOUS

PDF

66.9 KB Created: 2020-11-24 06:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b118b86382c541a32558350123dd24 SHA-1: 6eeb63c351b973a9e0b4a53358c8d781bb6a00a1 SHA-256: d8ba79c66fabd50b148bee0bb90af3f2f0a5324290cac16ee824c0176ad991b4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://traffmen.ru/123?utm_term=ramadan+2020+dates'. The document body, though heavily obfuscated, contains strings related to 'Ramadan 2020 dates' and authoring information, suggesting a lure. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=ramadan+2020+dates
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5faf04e7d5a18.pdf
    • https://cdn-cms.f-static.net/uploads/4416143/normal_5fb5b6f24c2dc.pdf
    • https://dolumipekino.weebly.com/uploads/1/3/4/6/134625527/pulofutorazanizo.pdf
    • https://futuziduxe.weebly.com/uploads/1/3/4/5/134508203/rulotufow.pdf
    • https://cdn-cms.f-static.net/uploads/4478430/normal_5fb267003d71c.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f89614d9e0d6.pdf
    • https://cdn-cms.f-static.net/uploads/4407989/normal_5fb6246495f5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/47dfc169-344e-4256-b47e-0ee57c6eab45/3911928082.pdf
    • https://uploads.strikinglycdn.com/files/49b9e121-bf7e-458c-8e5f-95ad85211391/82509467132.pdf
    • https://uploads.strikinglycdn.com/files/cd63e4a5-d61b-4a9c-99ee-387fba2ba43c/rozomigabefozu.pdf
    • https://uploads.strikinglycdn.com/files/b99ea1e5-eecd-4055-852f-15f3a21036b9/97403628186.pdf
    • https://uploads.strikinglycdn.com/files/6fd0fba4-7150-4f18-aabe-591b4ba60d42/ruzewijodofatil.pdf
    • https://uploads.strikinglycdn.com/files/ac9d4169-945e-474f-aa76-83f44be74b9b/citas_de_parafraseo_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/4c53ea84-a37e-47b3-b7ba-35090ef2f84f/wozebo.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_off0000cb61.bin
19f36cbe54b4e78941a83265b1d5da7b3d8ba4cf231bca4a60c1be7a99027022
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 5124 bytes
font_01_sfnt_off0000dcbe.bin
83dec1b90a1a7677f0bf449cb93db6174844e0579bbe4290914c0dbe6ed324b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 10108 bytes