Malicious PDF — malware analysis report

Static analysis result for SHA-256 640f611d946add92…

MALICIOUS

PDF

82.4 KB Created: 2021-07-12 22:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 240bceb0b1745600caf0f9d030079175 SHA-1: ecb8734508dcf95f5fab3771c1a09d8131413ab9 SHA-256: 640f611d946add92c404c933400fd13ae748804587fa86c77a2344deb6ad05a4
96 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The presence of embedded URLs, though many are marked benign, suggests an attempt to lure the user to external resources. The file's structure also shows duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8847

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/~3/7R6buoffwiA/square?utm_term=reading+and+writing+sat+practice
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7fd55c244202458b2074/1626111957772/warframe_how_to_trade_without_dojo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e844e32f85bf4fcbe7e1d1/1625834723488/hydroxyzine_a_narcotic.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e85e1550dfdd18ea50b640/1625841173902/can_a_bad_muffler_cause_rough_idle.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8d12e0ada229be57794d/1626115346917/11726510831.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7961b6dedd3ae167cc37/1626110305988/download_call_of_duty_mobile_obb_file.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7beabed7e63043962a694/1625800363865/nowokagepi.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec819f154eb17b6849c94c/1626112415852/kebasevixetuwusujopege.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_off0000e1c6.bin
974f746197f231ce885b5247e7498fac99fef8a4dcb007bc99fcaa318f48f088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 10652 bytes
font_01_sfnt_off0000fa1c.bin
f0fc57b25ef090618293f035b144dfbbac828b80678ab276ef2132811f4dfb33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16624 bytes
font_02_sfnt_off00012550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes

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