Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdc38b8bc6f070a…

MALICIOUS

PDF

77.1 KB Created: 2021-07-20 00:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a28c77521e192a0184496ca5c63025c1 SHA-1: 75464b8e3d2aeeea826b7403b09eb27c859b0aea SHA-256: bbdc38b8bc6f070aaa1778ef65231776bd923814c864c0ebc65654af964e86d1
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, though marked as benign, suggests an attempt to lure users to external resources. The PDF structure and heuristic firings point towards exploitation for client execution, likely delivered via a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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=game+of+thrones+political+map
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8f42cf107ff2467e7183d/1625879596949/94080231562.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60effc876611482e0a90afe5/1626340487394/how_to_change_a_file_from_to_jpeg.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edfe36ac614e13d1334dcc/1626209846168/things_that_rhyme_with_attention.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e93267085b1c120f98a1a4/1625895527231/school_management_system_project_in_java.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60efe6ed4063550b157b3b8d/1626334958092/106338607.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_off0000d05c.bin
f62501e3b754c50f0daa993839a2aae9dcb799938c486b6fca52d6fcfebc5912		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 15456 bytes
font_01_sfnt_off0000f7ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 16792 bytes
font_02_sfnt_off00011003.bin
69d46a9919abfc08be43cd947952d73ef2be86492e6942a3b1790ce50d2161c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 10784 bytes

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