Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a364df460c914d0…

MALICIOUS

PDF

72.6 KB Created: 2020-12-31 00:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b93d4f879884957e51446245cf937e02 SHA-1: 5248e9addfeaabe7d820c9360f85cb8d48dce6a5 SHA-256: 6a364df460c914d06c17c4e05b40e9700b9d2aa113576aaae797042c262cd5e9
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffking.ru/strik?utm_term=the+game+of+life+video+game+xbox+one In PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5feb68bfb357a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428341/normal_5fecfe2ef1312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5f9c2f34f36d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5f8a05bd07b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475216/normal_5fd2cfc0a213b.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/q7xhhhb/virtual_families_2_pc_cheats_money.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/Nhjd9qh/38806208868.pdfIn PDF document text
    • https://cdn.sqhk.co/jefokejab/d6egfcG/8762071840.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/mabikud_wojivexazam.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/6492c51a-2561-4f15-8775-684e6940597f/famous_dog_named_benji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11783684-e65b-4075-8333-2859e4921bb9/lapabemutemol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531bc3dd-1617-4a8e-9eb1-b724c24d0580/50915658870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4a0df5-df08-4351-843d-be07443a7002/98689479087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7557e90f-50d8-4025-9269-038a12597f8b/83626033442.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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 5264 bytes
SHA-256: c1432fff3a2cb0017bfe6bc8d8f3ee9df19c93cbb6cbec1e21ed3ff8c726988d
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 10940 bytes
SHA-256: ef1f8bc9aaabdf40d1c7bd598f79b6e6fce1b14ab8b3e2b1c1d232f720fe6c7e

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