Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fff113d779fc9d…

MALICIOUS

PDF

68.0 KB Created: 2020-12-07 05:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04cd524929ffbb0196dedd276d1901e5 SHA-1: d7da6d9ebe20223181065513fcd9e0201c128f70 SHA-256: e7fff113d779fc9d0abd3411a188dd4262caea948844a18594e8596fb40aab3a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafftec.ru/123?utm_term=a+mother%2527s+prayer+for+her+pregnant+daughter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5f8f5a5e7b5ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_5f9bbe060e38e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5fabb1601dbd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fc85aa91a319.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/xofigebu_dupoz_mevifufedufofon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365591/normal_5fc427f4709c8.pdfIn PDF document text
    • https://takozuvixisuwet.weebly.com/uploads/1/3/4/7/134716687/333952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5fb338cd6150c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_5fc57ccb6c25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f9e696a8b34f.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/5fc6e3c89ea50d41209e1b45/t/5fcd89e5fe657040d5aa4c18/1607305701559/57119877514.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_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 5548 bytes
SHA-256: 791430e06813fb76c461de8e25249b4212d03c1a9c091cc60ac1cf5d8d9c67b5
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 10292 bytes
SHA-256: 8ef9723212855fc8bf1bd77212eead8f28b9d84625542f99c197ed64a45401a9

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