Malicious PDF — malware analysis report

Static analysis result for SHA-256 347924e77a7c3b25…

MALICIOUS

PDF

77.2 KB Created: 2021-07-21 06:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cd536a263307246d68be865e760dce0 SHA-1: 14686d3fefc2bf0d95a12142b2e9b1f8c030ce8a SHA-256: 347924e77a7c3b256097ec4fb30d05f59c7f082e45cfd53badedc9230564c4be
96 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. The embedded URI points to a suspicious domain, likely a phishing site. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/square?utm_term=letter+names+bass+clef
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9097c8ce0e10532d1de45/1625885052816/puripitomutuki.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1538078fb23041a02d347/1626428289148/limits_and_continuity_graph.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e926212f3c4128e18a752e/1625892385227/deligaritizo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f7564481e2094e4d0c68e8/1626822213024/basic_computer_networking_mcq_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f421eb04a1d97017a30a6b/1626612203508/wixobobamalir.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 16792 bytes
font_01_sfnt_off0000e69c.bin
e4f67ff361581c517b8070220e767956401cb8f3a626c7668ae3f40f616b7a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 10384 bytes
font_02_sfnt_off0000fe1c.bin
ddfdd7008493bc0c27b2b913631cf73a0986062801b331e8a11418578b386e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 16768 bytes

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