Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c0afb15586523c…

MALICIOUS

PDF

67.3 KB Created: 2020-11-23 17:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7bce26e0c953d8c36a172b155bc6fe9e SHA-1: 1cd22e0fd70e7b4e632759ea89d316de411ff915 SHA-256: 26c0afb15586523c1ce5cf10fc77af2d7ebb322f592b5e696983362dcd331b52
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The embedded URL points to a known malicious redirector, likely intended to phish credentials or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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=cisco+firepower+1010+datasheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f93fcc2451ff.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/zeminemedubad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_5fb758b9bc7f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5f94489b678b4.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/6bcbe7dc-741b-49c7-a071-8746e65d5131/cms_mu_2019_reporting_period.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09976def-5f09-43c2-819a-fa96cd46e9dd/satin_jade_paint.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/98750615988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727050a5-704b-4918-81ce-faa98385e5c5/4215281809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2739d4d-05bc-40d0-86b4-062874240627/sfm_failed_to_lock_vertex_buffer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f082bb8-dec6-4f69-a9b3-40b035ae042d/58558724314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56daa380-dae5-4ab7-9bd3-16328f752761/dudobibodijozu.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/list_of_aa_approved_literature.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_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 5404 bytes
SHA-256: 2852eba0301195a9d3e7bf409fad6c48d8e52ae59fee823039c467f0bc942f6a
font_01_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 10808 bytes
SHA-256: 81853611b474b28d5de683b5ee3f9fcda671c2a99dd14438b23a2cb417d05cb9

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