Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ff87c1fd6e92a4…

MALICIOUS

PDF

73.3 KB Created: 2021-07-12 22:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fa1ff90da9445801a3375116157b916 SHA-1: e0a38b08e23e958bfc46e1e18c98998518721ba2 SHA-256: 83ff87c1fd6e92a448d40b5a5a35fb40adc128336523b91969802a004cfd59fa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains embedded URLs, and while many are marked as benign, the presence of obfuscated content and the overall detection suggest it's designed to deceive users. The file's structure and embedded artifacts do not provide specific script execution details, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8363

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://feedproxy.google.com/~r/sq/ugae/~3/5Aj-mlxkUx8/square?utm_term=b1+grammar+lessons+and+exercises
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e908a1c0906550d90a3fe1/1625884833668/37219658758.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec836d3a853d606aec8758/1626112877756/foundation_of_information_technology_class_9_solutions_chapter_2.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e86e61936f9f5651d505fa/1625845345351/how_to_see_who_viewed_your_instagram_account.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7ab5886d8930991a3bf8c/1625795416179/what_is_a_burpless_cucumber.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e78f8451cb2a526cf85f11/1625788292936/pins_and_needles_medical_term.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f4635ebba154a8fa2877/1625879652356/spoilt_rotten_meaning.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_off0000c044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16792 bytes
font_01_sfnt_off0000d85b.bin
b99779d74794636d390e6f98579ce82eda713b20f0e1f0d1797dd8828006fb75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 10820 bytes
font_02_sfnt_off0000f125.bin
a4f3fce0920e6b2cd3d97968fa2fe651f1c428b414ec5f6161dd7868230107c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 15712 bytes

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