Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9b54b2a41879d9…

MALICIOUS

PDF

65.5 KB Created: 2020-11-25 13:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6074457e1517a34a3a0a8b05e5c18651 SHA-1: 925ef06b4d623d03907fd252a4655fccb07d2114 SHA-256: 4f9b54b2a41879d9eb2c220aa44454923a68ec754acb902fac8f92fad576c40d
156 Risk Score

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://trafficel.ru/strik?utm_term=yod+symbol+mason PDF link annotation
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/natabibekozovomuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_5faa161e1f5e8.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/d3aa1f56b283dd5.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/wamoxalewileso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_5fbe3340029bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f874c6b4ed4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_5fa1ecb165b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f8d36ba98b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_5fb9f28a4d4cb.pdfIn PDF document text
    • https://fosilele.weebly.com/uploads/1/3/4/5/134593504/gututol_wepebafarapug_polunu.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/e06f1943-e083-493a-bfa5-53da0682c731/91492982784.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/30_second_elevator_pitch_template.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_off0000c38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38C 5076 bytes
SHA-256: 621080107e51bb5d3e14b7249940ccfaa0451aba7c9b3ec403ca5389c836d15b
font_01_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 10928 bytes
SHA-256: e51c1b0aa5f875fbb422ddfa56f7008cbc154258cbb691f464ba11aaabf6e2c1