Malicious PDF — malware analysis report

Static analysis result for SHA-256 422eae0e4d51a7c6…

MALICIOUS

PDF

68.1 KB Created: 2020-12-22 04:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d883f49303e695db577e6d47c499030e SHA-1: 75451b490c6ef6bdee71a4de4764f43d60c8b3f3 SHA-256: 422eae0e4d51a7c69ab9672fef953bdae5450080ee9825fd0a1bc2b5f99e2ba1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging it as a 'Phishing Trojan'. The document body, though heavily obfuscated, contains text related to 'Accountability performance appraisal phrases' and the authoring application is wkhtmltopdf, suggesting it was generated to appear as a legitimate document. The presence of external links, particularly the one to 'trafffi.ru', indicates an attempt to redirect the user to a potentially malicious site.

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://trafffi.ru/aws?utm_term=accountability+performance+appraisal+phrases PDF link annotation
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/09fb62cf7.pdfIn PDF document text
    • https://gedikitol.weebly.com/uploads/1/3/4/9/134901051/a28456d321ba.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/3634186.pdfIn PDF document text
    • https://dadopulemuxujew.weebly.com/uploads/1/3/4/3/134375911/nojaja_dilogijurumowid_janaxo.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/63f44847-10be-4545-b1de-d4b4d17f9e5c/20924013368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9b432b-8e76-414f-9b3e-a4535921a547/86967703461.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfa70edabee7b44073d26/1606220401153/regionalization_ap_human_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/mcgraw_hill_ryerson_biology_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5e6001-00fc-45bb-b606-fe5f660109df/columbian_nun_porn_star.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01383fdc31513a10553e/1606222137237/new_mastermind_game_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/11218358615.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc555ab88c99b6d37c4c7cb/t/5fcf2ba9798354522d0a13c3/1607412650167/81483628708.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19a8f40f1034a5caddecf/t/5fcb931ba0b42e3566aa7bc5/1607176987459/zinopuzafupojada.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_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 5484 bytes
SHA-256: fdc834371db7aaff4cb677f2a936baa1778b33bee1965486d72e9d590da04833
font_01_sfnt_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 10500 bytes
SHA-256: 346b54a428e10840679c7713cae51912d175e88328477eb95d8aa9562d8e14c8

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