Malicious PDF — malware analysis report

Static analysis result for SHA-256 496c3cc8b91deb60…

MALICIOUS

PDF

85.9 KB Created: 2020-12-10 05:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eca493a2913b1503381360e47b4fa2de SHA-1: 1c904b7ee008c24b6e75c7c3274861fea4d4b487 SHA-256: 496c3cc8b91deb60f7e92ff973e72930c2490d4a6518d91c1e18393501031605
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate that the document is designed to redirect users to external malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/aws?utm_term=creative+designer+cv+format
    • https://peketavapi.weebly.com/uploads/1/3/4/3/134331612/tinikifiv-laxadejakusoj.pdf
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/puwulagiwibumijak.pdf
    • https://kagapefox.weebly.com/uploads/1/3/4/8/134846757/guvudavumoje-rusanulixuma-sulazadiwiz.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/717513.pdf
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/978cacc0cb8b85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c4952c14-a5a4-4bd9-8bd8-1ef4781f79f6/dance_lesson_gift_certificate_templa.pdf
    • https://uploads.strikinglycdn.com/files/7217b4b7-7c79-4840-96f4-7918f2140f6f/airport_mania_first_flight.pdf
    • https://static1.squarespace.com/static/5fc191a61452f90b7fea0e1e/t/5fc6f527ad3e64119239179c/1606874409284/download_video_wallpaper_setup._exe.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe19a53570fb44d1cb8b62/1606293925973/bataxutetimero.pdf
    • https://uploads.strikinglycdn.com/files/8c885ce0-521a-43e0-8432-323461d3782f/sample_bank_statements.pdf
    • https://static1.squarespace.com/static/5fc0f88bd26ff1194f740ef3/t/5fc9f82a87b36f46d403f8db/1607071792289/six_stock_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/09b9fa9f-2789-4be4-8b7a-c89fc6cbeaa9/ssas_interview_questions_mssqltips.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011426.bin
532811af5f644c40063778be28c033d0981c9f5c7beccbb1c3a1f7e33d9106ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 5276 bytes
font_01_sfnt_off00012608.bin
0453143c8f34a388631ec983d7f90512c907065f5037ad3e8a4cbcfe6a30752f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 10856 bytes

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