Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe78bc0cd70fc2cf…

MALICIOUS

PDF

77.6 KB Created: 2021-07-20 07:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88a936bab326cbd1b56d6868e22fab25 SHA-1: 0cc9ebbc0df9bc49f98581cc8a0f5abd06b5d38a SHA-256: fe78bc0cd70fc2cff34e076dc113b9e5a65177f6ace7e7cac81804d66fc69c54
96 Risk Score

Malware Insights

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

The sample was detected 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 exploit delivery mechanism. The PDF structure and embedded artifacts are consistent with known PDF-based malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7691

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/aauXj3bnHUA/square?utm_term=1+day+water+fasting+benefits
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee08acb1f8b9564881b938/1626212524323/approaches_to_corporate_social_responsibility.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec917c51a87c5d75acfd96/1626116476454/that_time_i_got_reincarnated_as_a_slime_season_2_episode_1_sub.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee615b114e6b7b7de924ea/1626235227676/83669928451.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_off0000ce42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE42 16792 bytes
font_01_sfnt_off0000e659.bin
0d860470a5f55a580feb2f8669cd69798a34e7c1cb902c589829fb3368f42890		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 10660 bytes
font_02_sfnt_off0000febf.bin
aa9c2a5ecf5038e8b654efd285a653dc73be35faab043a5cd3111197da2270e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 16452 bytes

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