Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eabbf6a370ca95b…

MALICIOUS

PDF

76.5 KB Created: 2021-07-15 19:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3640496bfeca674e9e240db30a776bb2 SHA-1: 8fea6cbfa02ec0d77bc6ce88c56f130e93ba6826 SHA-256: 1eabbf6a370ca95bd448693acb510e0acd5980d709e9aed89fc12e2711295b1b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 an attempt to lure the user to external resources. The PDF structure itself contains obfuscated content, and the wkhtmltopdf authoring application is sometimes used to generate malicious PDFs. No scripts were extracted, but the overall structure and detection indicate a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/eaN1Eb74jJI/square?utm_term=lohengrin+elsa%27s+procession+to+the+cathedral
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e872b35b24ce19dc58dc16/1625846451655/project_management_goal_setting.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7cfe051cb2a526cfc2177/1625804768975/thermocouple_thermometer.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0200a34f25751eec3c57f/1626349578174/34879824079.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f025a4c0b35f4fb3dca327/1626351012706/barry_pepper_saving_private_ryan_quotes.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efece1c57e07264c202287/1626336481580/15000_euro_to_inr.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_off0000c525.bin
c2dd3baaaf3639a9fda3d95ce583c3eb0772a4e768c3265f48bacfa8e23f9edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC525 10784 bytes
font_01_sfnt_off0000ddbd.bin
76399732edda2be9c6ef9a8f0b77766318c2fc6fd6e8a9e79704ccf1d451c482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 18188 bytes
font_02_sfnt_off00010ddc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 16792 bytes

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