Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ba94e1d81730fa…

MALICIOUS

PDF

77.0 KB Created: 2021-07-12 22:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b82023f184d6f18f5f27b55e311c639 SHA-1: 1ba681dccc4e8f42f37e97f1006b1e61d5ba8170 SHA-256: c4ba94e1d81730facb75062e14ac5041ca29e67274471cc95461b328db662666
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan', indicating a malicious intent. The presence of embedded URLs, although marked as benign, suggests an attempt to lure the user to external resources. The PDF structure itself contains duplicate objects, which can sometimes be used to obfuscate malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier clean score 0.1551

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/~3/0YvHz_IItD0/square?utm_term=life+span+of+rbc+and+wbc
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8e76e0c99b3eb2d36b02/1626115702138/a_double_minded_man_is_unstable_in_all_his_ways_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_off0000ce9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 16792 bytes
font_01_sfnt_off0000e6af.bin
e6f9d4df635d52db9d76e1fc73e83608cf3675008a06f80d483378d90df47a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 16108 bytes
font_02_sfnt_off00011038.bin
234f3f368da5525876e9940f2f4c7507b7338d9abde50426c02a16da3e8e675e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 10652 bytes

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