Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf63a6a0fd12a6b…

MALICIOUS

PDF

64.2 KB Created: 2020-12-05 17:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2acc01fe5f0d390b811f07284f2775b6 SHA-1: 7a916452e44b01fd72cda44379deb80e9952da98 SHA-256: caf63a6a0fd12a6ba8fd35a0a96aacb128f206af710805a4b6daf0f98f7b1c9d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, with the primary suspicious URL being 'https://traffset.ru/strik?utm_term=flesh+tone+rgb'. This suggests the document is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

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://traffset.ru/strik?utm_term=flesh+tone+rgb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485704/normal_5fbf7e0d46842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fc3fd0fa04a9.pdfIn PDF document text
    • https://zanagolebiwom.weebly.com/uploads/1/3/4/9/134900312/1487733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421214/normal_5fc4c2e737ec5.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/xujize-penalinuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f9839d5620a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5fc3f50b1047b.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/aae59ce2-ce87-440c-9f39-7ffb968032bf/can_we_autocorrect_humanity_lyrics_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6648b4-bf53-4315-9f17-dca0c4c5512f/honeywell_vista_10se_programming_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d41561-f598-4846-b7e6-f6bbdc9a64a3/ocean_waves_and_tides_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab9c7d5-06be-4bb8-83f1-fea4825ff441/sowesibonetofiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7651d57-ae79-410f-8796-d463896c5782/tatuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eee82b0-e65e-4856-9c5e-a3807b5c9e71/renewaire_ev_130_parts.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_off0000c311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 4832 bytes
SHA-256: 16e3098177ca5b01a8d72acede9f8af3e9f1be60b19a1959179d9d48bcabc563
font_01_sfnt_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 9732 bytes
SHA-256: 3a4249123b6a0c583a9217341188722817eb3d538393e46916ebd87de337b1ec

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