Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cf70f2ea1124a4…

MALICIOUS

PDF

69.3 KB Created: 2020-12-22 03:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b1f2854acab6732b644c7f6e2510f0ed SHA-1: 3fc45f1fd8ec7f215cadb1a66ba171b74cb79ff7 SHA-256: 54cf70f2ea1124a41c626e79f30ee05df9314682ee0f237a0e88652b3ca5ef0b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/strik?utm_term=dexter%2527+s+labyrinth+game+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5fa11319ede8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fcb56b9542e2.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/2796375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_5fbbf784db5d2.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/412214.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/risuvatupese_vewaleritejugij_sejuvi.pdfIn PDF document text
    • https://kofudoraf.weebly.com/uploads/1/3/4/7/134716635/mawivage_gozabuxoxipap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f86faa7f1124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_5fba872da1f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_5fb73b4b4167f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25b336a-d185-4eb0-ab65-6f826ec47d4a/falexanoxodibozogedodiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2166c5-2416-48cc-86d1-950839a32a38/domaine_d3_c2i.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_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 5440 bytes
SHA-256: 128c4faf28861fc2eaccfa5cb97071e56ca810f2a5e62a8ed2708edd004428fe
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 10216 bytes
SHA-256: 1754b2ae414e0e5417aa6acd30d91120b438c437b9e531dd1fb02a333da0b69e

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