Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6817aeafb22384…

MALICIOUS

PDF

79.0 KB Created: 2021-07-15 23:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ad7c15aed41c7e505453d1753c6e12c SHA-1: 87e6f6e4ef96522b0ef00fc1b7742872ec4f3b0b SHA-256: ca6817aeafb22384f3611e5a91987535463c2b6ce1884f1de7351ea575578248
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The presence of embedded URLs, though many are marked as benign, suggests an attempt to redirect the user to a malicious site. The wkhtmltopdf authoring application and the nature of the embedded objects point towards a crafted document designed to exploit PDF vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9098

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/EjZ5HCEZs_A/square?utm_term=negative+prefixes+and+suffixes
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8dfa97282d6f46910ddc/1626115578760/elements_of_literature_book_answers.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee4483e03b615e098ea783/1626227844069/how_long_raw_chicken_out_of_fridge.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0843acd12aa5cbeb93bfd/1626375226650/putanadaledozivesebim.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f078813f5e7b0f5ec49c18/1626372225727/after_effects_web.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8e479c4c1a734c5d35bed/1625875577374/toon_with_me.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f07ff1be92cf3515356764/1626374129727/today_promise_word.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee474d537273346e306bb8/1626228558049/beans_with_plantain.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_off0000d954.bin
dcf16fcca8f124748a44106376084024a0dd520bc01b14267826a399a121a65f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 14948 bytes
font_01_sfnt_off0000ff3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16792 bytes
font_02_sfnt_off00011752.bin
ead63622817ee6e939f53ff37040cee7d528ff49b61f6708f3f99c4c1d93e7a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 10752 bytes

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