Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d58f65d5765b60…

MALICIOUS

PDF

65.1 KB Created: 2020-12-18 22:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4bbd161b837e5041e3a2f1bccab7d738 SHA-1: 28ceec8d38f8c341aa5ecda3073f107d23b62c2e SHA-256: 81d58f65d5765b605eeeaea61a8d07765dbdfb0283375ea35f0fdf06bcb1b3b6
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'https://traffnew.ru/123?utm_term=learning+to+read+by+malcolm+x', which is highly suspicious. The document body, though heavily obfuscated, appears to reference the book 'Learning to read by malcolm x' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly indicates a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=learning+to+read+by+malcolm+x PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fc7f1d451196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f8a51f9e8f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_5f91e1aad8ece.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d900d26ff1194f736c6f/t/5fc0f8b03570fb44d125ee78/1606482112298/walozo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc72bd50d716e027b02a770/t/5fca68c88583b415842e5a9b/1607100618145/ranked_voting_system.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6e50d9ea50d41209e2688/t/5fcdb5b7eb18547f4ba2bd33/1607316929452/magatupikovudedovuxidovew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131d02bb-a27b-4580-95bc-14ddb748f426/padas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377e6cda-ebaa-46b8-b52c-24491aa1eb12/dictionary_of_landscape_architecture_and_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f7f805-03f1-45a5-957d-df86c4598c54/55139390947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928d5bd7-890f-4dce-8650-67075f6bc7b5/nukekebigokizoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37a8a53-4013-4c6c-95ae-ddf897a1554e/free_download_free_video_dub_portabl.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_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 5332 bytes
SHA-256: 3e5794bbaabbb3cc47492b34ad0b1acac4149b129581f579e489a8d16d7a4168
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 9848 bytes
SHA-256: 0712c1e4d89bbbf8101868f2a7c666427223526994010f4ffa362269cfd85649

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