Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c4c84a4a92c547…

MALICIOUS

PDF

90.2 KB Created: 2021-07-15 08:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71ab703d545e5b038748576aaffd23b0 SHA-1: 174a0494684ce0c545a4cec7f22fff80ed2f3542 SHA-256: a9c4c84a4a92c547e28d47e70f68092f5836f4dc2e8558cf3e48da746f546707
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3801

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/-7-cX3opz_8/square?utm_term=spo2+meaning+in+english
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edab97c48108232e465a01/1626188695177/35377275518.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9386a83ae0c490239e066/1625897066884/srs_document_for_banking_system.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7b670cf33f708d79920a/1626110823553/fupesasivosema.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edcc2f4c056a31b8192f36/1626197039646/lomokurizipatetute.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f916.bin
85e4d46f0c34614f0fc286e7bf0769b674cc6f42d68a1d4cee0e1a6862965ae8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF916 29352 bytes
font_00_sfnt_off0000cf21.bin
e960ae47609710be68274e284d8ffb89b425d03f76a59a00f258ad13dedba0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 16260 bytes
font_02_sfnt_off00012c6b.bin
2f3deec6f72003e5ef5a1b8e11725600103b113343725d81c3cd0e17717f3d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 10696 bytes
font_03_sfnt_off000144ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144BA 16792 bytes

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