Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6f83a16d91918f…

MALICIOUS

PDF

59.6 KB Created: 2020-11-19 19:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 86fb914df286dae87300a4e8cd6b3bac SHA-1: 72ad52f8d7429f76b1113d3f8e8c776b418e98ed SHA-256: 9e6f83a16d91918f0df7233884aa25ed5a6a4b87a0b23ce038aa037595b15c54
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the primary links directs to a known malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malicious redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://cctraff.ru/123?utm_term=words+start+hoi In PDF document text
    • https://firupewuvub.weebly.com/uploads/1/3/4/3/134330425/wabotipegevunedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_5fa4d0e49ac79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5fa4b60233885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_5fa6f827bf5e5.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/1641091.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/nolasobu.pdfIn PDF document text
    • https://jakinamil.weebly.com/uploads/1/3/4/3/134391996/cc9c01e437d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f9bc17562944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_5fa3aff0e8e38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405662/normal_5f99be4499117.pdfIn PDF document text
    • https://sukevimekixav.weebly.com/uploads/1/3/4/5/134599702/zatozupakebusikolaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5f8d7beab14da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5fa5a3011a396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5f9a205a3fa70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450243/normal_5fb38b7b02ea4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 4892 bytes
SHA-256: 5758cc1fc24676ad4af630a7ae874ccbc95bf3dfb08954095348b3e643289aa1
font_01_sfnt_off0000c0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BB 9620 bytes
SHA-256: 5d5e123d36ac2437b28fb82e8f3b09d2f1425dd1a6ba4a049dad812befe470c5

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