Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fe3bdc50390a2f…

MALICIOUS

PDF

75.9 KB Created: 2021-07-15 22:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04d3d2d668a84aa4c4b015c8615e79eb SHA-1: 644326d84b334d13177b77c06278ddd1f069d942 SHA-256: a5fe3bdc50390a2f98da1ce6a7512b21b1f14b4c92e6fd3d35e0161fa97425e3
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or malware distribution vector. The file's structure and heuristics point towards an attempt to exploit vulnerabilities or trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

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/~3/9xivtwLAy4k/square?utm_term=business+english+reading+comprehension+exercises+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd892ea8d40126a1b59a2/1626200210317/chikmagalur_homestay_for_couples.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edab6f0999c45203738354/1626188655559/dovetofawodi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e914a66e267257943a5d69/1625887910804/60244666570.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee19b1eed6cd77ab5f783d/1626216881599/thoptv_online_streaming.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60effc26c57e07264c20ba5f/1626340390771/happiness_and_prosperity_meaning.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_off0000ca1c.bin
5fd1fab3b38e7fc1071bd366ea3b1ee8993ffab77774a763ae04ca70b4fca202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 15340 bytes
font_01_sfnt_off0000f12a.bin
7444b52f580f4b0bf6e3935105e4b9506cf3d6c0d28b86a0171322035b15c6e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 11224 bytes
font_02_sfnt_off00010b0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 16792 bytes

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