Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d8e31e8647d60a…

MALICIOUS

PDF

72.2 KB Created: 2020-11-10 20:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 013ca8f1129f94581de597a0ca6be078 SHA-1: dbaad74c9d3dbeec9f3b3e9ff611cae9c7375a97 SHA-256: f3d8e31e8647d60aeb6248238a25ca350bd09d3d64b61c7cd155b4bd08602f51
214 Risk Score

Malware Insights

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

The PDF contains a link disguised as a 'Chapter 8 photosynthesis worksheet answer key' which redirects to a known malicious domain. This indicates a phishing or malware distribution attempt. The PDF also hosts a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results or distribute malicious content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?keyword=chapter+8+photosynthesis+worksheet+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_5fa1328b029a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f968f71bad7d.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/bc7bbc.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/medaxivojoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_5fa66200683f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f8ae9124e2be.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/978aa966-001a-408d-a384-595af3a43415/81335349286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c23970a-1c66-4f46-9c16-e147d3f0b2fd/21666882883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b9144d-9965-4e7a-93e5-0bfe5c83a4f1/vomulejesugofal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d15281-a662-4707-9969-e860cbf5df25/28038827216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d78265-49ac-4505-9cc6-110029a1a843/possessive_pronoun_adjective_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14b266f-48bb-476f-b270-78689179f978/80837468.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_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 5232 bytes
SHA-256: 2f2fa0d5f02a3c17bee25d8326cd28f7849e8d3f405c4a39e440fa9f66baa18d
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 10288 bytes
SHA-256: ededa4c0f166cde28ac1b4c7934c89270775e5ccf1b70a4af58cf120307f9b60

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