Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97f3d5f1c13d121…

MALICIOUS

PDF

79.3 KB Created: 2021-07-21 07:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0084036bd4e975af3de3ded379fdb1a1 SHA-1: ffffea1dfbb3c69ceeb451327823b393abdf5534 SHA-256: b97f3d5f1c13d12102fde549785124f9f0cd4d1d672801b431a568f768e0e2bb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of embedded URLs and a 'download button' heuristic suggests a phishing or social engineering attempt to lure the user into downloading a secondary payload. The document body appears to be malformed or encrypted, preventing a deeper analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9478

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://feedproxy.google.com/~r/sq/ugae/~3/ZV5PD9BTPXI/square?utm_term=pdf+competition+books
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8565e8f65f47218914bd6/1625839198898/free_merger_and_splitter_software.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0b047f8ef4e01cd5574cf/1626386504038/what_would_win_a_polar_bear_or_a_grizzly_bear.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e76dd18bfe59303b3fd20b/1625779665308/funalape.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f187a0b3a282695d3748ff/1626441632332/class_7_science_worksheets.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f4812a6f785f5832666b/1625879681717/52980918417.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8d65bcf8be39b505f86e/1626115429546/78697337386.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f713d156c7c54ad386de11/1626805201810/rasogukizagomimepesurejol.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f54901cba7b71501fd5ca3/1626687746081/greater_coucal_in_malayalam.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_off0000d1ce.bin
7656f4b776accd322cf04d419857b7d6fb7536af41904455623fd08345208000		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 17780 bytes
font_01_sfnt_off000100d1.bin
dd1b0d5db17b3ee6d1378bf9d759bbfb4c735cc4eb6d8d2f0e2d12bf75e8df3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 10708 bytes
font_02_sfnt_off0001192d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 16792 bytes

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