Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f8a53a17462bfa…

MALICIOUS

PDF

67.6 KB Created: 2020-11-21 22:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f23343af0a1efc7fd6844d9bf225ee0a SHA-1: cbde1c2b68b06ba67ced7832f2d1b8887ebe969a SHA-256: 64f8a53a17462bfaef9fb61932cf7c69eeff00d2b7042ad5cc331f7be02fe8ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism for malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt, likely leveraging T1059.007 if JavaScript was present but not explicitly carved.

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
  • 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/123?utm_term=noncompliance+care+plan PDF link annotation
    • https://bejobaxugifupe.weebly.com/uploads/1/3/4/6/134628864/baturenepopoki-timakozukomu.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/f87be04679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_5fb273a9c2eab.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/6382800.pdfIn PDF document text
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/8f63d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fa8d11d42eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f9e0fedd71cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5f9842d6c4ebe.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/f74c32f8-cc8c-4421-a3f9-0849744bf7c7/vector_calculus_6th_edition_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f78129-0b02-4df9-afef-169a8fa31e7f/wusolepibimotosamovelomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c17b5e-f21a-4a70-ace8-6c9722ba0d08/genetics_comparing_mitosis_and_meiosis_coloring_worksheet_answers.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_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 4872 bytes
SHA-256: bdf906b67e7591a9db2d4686a04d1de4c46b8a9865d2d1ff3a99013276409eac
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 10076 bytes
SHA-256: 618e51fc96063e0c07ac739fc6fff6f45ed928e6044e8fcc3e113a2a8feef1d5

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