Malicious PDF — malware analysis report

Static analysis result for SHA-256 c971d67454cbf055…

MALICIOUS

PDF

72.4 KB Created: 2021-07-12 21:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5240096c455fe2e4ae4c948c96428f1d SHA-1: 6eb1959d7db3ab3a8d42cd741f15700582f8c661 SHA-256: c971d67454cbf055ccbfd5558ba8552226fd7649b58e4b1842a676d69375e1e9
96 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ClamAV with the signature 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' and also by an ML classifier. The presence of embedded objects and the nature of the detection suggest it is designed to exploit vulnerabilities or trick the user into executing a malicious payload, likely delivered via a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7342

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/nCRFBnYrBHY/square?utm_term=interquartile+range+and+median
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7bbd838ed220952abeb6f/1625799641014/waxagajizevoxegekikoboso.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e94bc8b68d8f0f4bf9993d/1625902024263/31819336254.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7357288cf71862a7e7cd/1626108759157/95306625300.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_off0000ba3f.bin
b9e8b18e09fe37b13f996381af3dc121cedb43bc236bbffaaf41d74eecc1a794		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3F 17020 bytes
font_01_sfnt_off0000e6c4.bin
acd40bd3325813f18a11596723b22c108fdea99b6f27cb6b328773010edd3bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10500 bytes
font_02_sfnt_off0000fe08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 16792 bytes

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