Malicious PDF — malware analysis report

Static analysis result for SHA-256 91357d41d250de61…

MALICIOUS

PDF

75.4 KB Created: 2021-07-15 12:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfca2ed089c71c8a635cc4024c569c50 SHA-1: 827c4e746717a096c6574832251fba20c74bcd87 SHA-256: 91357d41d250de61160e514984212a88a1eab9993dd1c627e8ff1410d8a899f8
96 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier, indicating malicious intent. The presence of embedded URLs, though many are confirmed benign, suggests an attempt to lure the user to external resources. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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://feedproxy.google.com/~r/sq/ugae/~3/ZFaGRQ6RLlg/square?utm_term=in+what+organelle+does+respiration+take+place
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7e67c81471576eaed65b5/1625810556500/the_baby_in_yellow_game_free.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee16cb588fb5669511611e/1626216139918/independent_contractor_income_tax.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91cdf3f195e1e4036353c/1625890015950/ascitic_fluid_total_protein.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7aae9bab062161335ab18/1625795305406/you_can_do_it_put_your_back_into.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eff89d36870d1a2db6f0a0/1626339485955/oet_reading_answer_sheet.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_off0000c84a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 16792 bytes
font_01_sfnt_off0000e05c.bin
9f2d4c5aae71bc272b1e6d64c4537b90da887b7a8612a5abd37182ca7c704254		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 15640 bytes
font_02_sfnt_off0001087e.bin
82da6808e8243b035250d8794f62b5528e05983b040b567e9fb1603159d960dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 10920 bytes

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