Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a383636c57c20e…

MALICIOUS

PDF

63.0 KB Created: 2020-11-11 10:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c177adee84af833789094560f3f05d45 SHA-1: d47a2be09df4bb37d2b078dea5386f8772a03c6f SHA-256: 45a383636c57c20e83f1bb38ad06edd77fd61f1b2c8985cd74b512df33c539fd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URLs, 'https://trafffe.ru/strik?keyword=jbl+endurance+jump', is suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of embedded links suggest an attempt to redirect users to potentially malicious content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?keyword=jbl+endurance+jump PDF link annotation
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/3482246.pdfIn PDF document text
    • https://zafojepomekosax.weebly.com/uploads/1/3/4/3/134352399/6855813.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdfIn PDF document text
    • https://gudagomafefaxer.weebly.com/uploads/1/3/4/5/134523608/lenus_jedor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/woxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/42190442915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98fbb74e-0a02-4354-be71-5c0dda39db74/37237472783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fe1a12-9c33-4af3-b435-8aa61228979f/32409969937.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/the_cemetery_club_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8e5016-f163-41ab-a2a7-bee9a3de9fb0/disorientation_guide_cambridge.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/totevif.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/cask_of_amontillado_activities.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_off0000b9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 5244 bytes
SHA-256: 6df39e0bd9bb4609cd87eabeb2dc73679141ca3a3388352723c45e099e4102f7
font_01_sfnt_off0000cb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB72 10616 bytes
SHA-256: 87b21ce843dfa8b81dc8ec99a2c3f3d70d5ebb780be0d2c6e55c16c1c67e72cf

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