Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce95345a5f5f3531…

MALICIOUS

PDF

89.2 KB Created: 2021-07-13 00:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f37e8bfaf0bc776668b43e4c7e7e8f67 SHA-1: 44da91f18c9ac052aa511aa843f91fb9944e63b9 SHA-256: ce95345a5f5f35319a3e21079ee1a00e7e380961245652bd9acc4135e47f1752
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, specifically https://oniceh.ru/square?utm_term=common+data+structures+and+algorithms+questions, which is likely used to deliver a secondary payload or lead the user to a phishing site. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8615

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://oniceh.ru/square?utm_term=common+data+structures+and+algorithms+questions PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8764168345d38e0ec22e2/1625847361165/clive_cussler_books_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecafc174517d3de2171ba1/1626124225752/bitaloket.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec923c934d360eb2897d04/1626116668370/how_to_get_cayo_perico.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e893b9a0198b24b4c6b252/1625854905400/46580932943.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7f21dbb514329faec2d3/1626111777245/sefabosaxowimoni.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7adda81471576eaea74eb/1625796058326/fulebeguworokaxol.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecae78f9f3f24b30c4bc05/1626123896122/chat_ave_gay_chat.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 17776 bytes
SHA-256: e3bf84b8eec9d470b2de5f62c3d3701befa8b2288fc28dab171e7e62d8cbc07b
font_01_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 11092 bytes
SHA-256: b11ab0c173e7c317f2a10e07f7e9ca479a3e158edb848e8373e37c7d989b8367

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