Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a81e36cee6ff6c…

MALICIOUS

PDF

85.0 KB Created: 2021-07-21 19:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac80ac630611c0415672cb8a419fb138 SHA-1: 5278707fd8bfce013ec7441fc8fcc176a2cf1060 SHA-256: c5a81e36cee6ff6c0ca8a4536163d9030c0f6a7200dd1f59f4eada8546322608
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 that likely lead to phishing sites, a common tactic for credential harvesting. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into navigating to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/S-4CHg4Qmwo/square?utm_term=notes+on+css+pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f727983bac255d6bf15069/1626810264689/advantage_of_centralized_curriculum.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f3894326e2e727c264742b/1626573123173/oasis_pool_and_spa.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed8fa7c439f8287166f495/1626181543268/79574724869.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3426d6678663e6a2f9cb7/1626554989968/best_way_to_clean_boots.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f6169e66e8821a32bff45b/1626740382310/how_to_write_a_board_resolution_letter.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee6365fc191471fc6ebf71/1626235749264/xedemalakifomedaworasub.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f06071fb04a932b0d204ac/1626366065643/ants_eating_tree.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2af1427519501fc0ab658/1626517268475/tugoguperes.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79b3d1873c46ac935b9ad/1625791293717/real_boxing_game_download.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f154bf4be5f74a98e29471/1626428609672/change_of_doctor_appointment_letter_template.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed928df95b5524f95581f3/1626182285356/a_solution_turns_red_litmus_blue.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e96055e370ac63228ab0d4/1625907285941/36579264756.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_off0000ea9e.bin
e822b5f573448973a45fa4eda6126db6ce1327136c606ce9c7846d68605c493c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 17024 bytes
font_01_sfnt_off00011717.bin
cae646bca108b19b46ce664373252e0981e3f22375b4dacee3c4f555bb02774d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 10192 bytes
font_02_sfnt_off00012e12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E12 16792 bytes

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