Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdf6c16b7204a9c…

MALICIOUS

PDF

77.4 KB Created: 2021-07-14 03:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15cf6189bf15efa9332d7648e5371215 SHA-1: 5f529a05bf00554597754047cce3e76df036f84f SHA-256: 3cdf6c16b7204a9c0e67f9dcb7ee07b2381d68ac205f0a117b35b2aadf8126f6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URIs that likely lead to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious external resource, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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/razvivatel/yapz/~3/0YvHz_IItD0/square?utm_term=first+signs+of+a+stroke
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee09488e3fff2bd3bc5544/1626212680187/85558509172.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94bcef4fe78435a3c0501/1625902031029/dye_mixer_industrial_foregoing.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93d5ec91b61347ea488f4/1625898335149/least_stressful_careers_that_pay_well.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7cfa0dbb92d34f5ae24e4/1625804704475/54924228472.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_off0000cbd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 16792 bytes
font_01_sfnt_off0000e3e9.bin
2cd50349de575a5b96b0534406eb9957ab59fdc675584c6fc4fce662b51ce5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 10412 bytes
font_02_sfnt_off0000fba2.bin
344575aed8c9aec5060ccf09965bbc179482d54b4944758d042bf6d89a2ce8aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 17176 bytes

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