Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb20e8f2a483aa7…

MALICIOUS

PDF

65.4 KB Created: 2020-11-18 08:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2eb1bb479c50769d2880cde234ede53 SHA-1: 12bf788765de2100ccf44c474dde7bd1377aba11 SHA-256: 8eb20e8f2a483aa766909f0b0a59752dd6a8006c4fe5014f87d2c1870b974071
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/123?utm_term=touhou+moriya+shrine
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5fb484cf19b85.pdf
    • https://pexazunawilaga.weebly.com/uploads/1/3/4/2/134265520/vutuveni_gubejedeke_fetinuv.pdf
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f89de2662053.pdf
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5f9b2e234ed71.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f8dda37cbc02.pdf
    • https://cdn-cms.f-static.net/uploads/4409609/normal_5fa02f039cdb5.pdf
    • https://cdn-cms.f-static.net/uploads/4417129/normal_5f9e8902e29ce.pdf
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/9987527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/84246428-48fa-4f61-86ee-f6b8a5275b73/rebokuxipajerakoxab.pdf
    • https://uploads.strikinglycdn.com/files/3be4e47b-4f44-43fb-8583-8a0f4f43ae9c/critical_care_pocket_guide.pdf
    • https://uploads.strikinglycdn.com/files/baab222c-0e27-467b-b35c-af24444dee47/toramumiguvedodika.pdf
    • https://uploads.strikinglycdn.com/files/09ca28b9-6652-4278-b867-2595b4f13f66/mikujexonag.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_off0000b79c.bin
9c9cee2e1e60dc9ec4b50c1933c9b436f43681c96bf8cf798048672d1c0eee43
pdf-font-stream PDF embedded font (sfnt) at offset 0xB79C 3752 bytes
font_01_sfnt_off0000c4fb.bin
d8f232668e105290b4ec06e2270299d0d0274a4a780772f2d2decb8d4a96a214
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 4944 bytes
font_02_sfnt_off0000d5a2.bin
b9c9d4aacfdae49c6fa5265f193bf2ac4c1da4849e1f584db05d8614b805ca83
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 10380 bytes