Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8146280d0c028b…

MALICIOUS

PDF

91.3 KB Created: 2020-03-16 17:44:07 +01:00 Authoring application: Microsoft® Word 2019 First seen: 2021-02-23
MD5: 1553a235c2a86688c547f884bfdcf3ff SHA-1: b1a651cfc67355c7d4a326e84663242ef4cc3f13 SHA-256: 3b8146280d0c028be6fcb804a07871a11afcb469ce7aa832033cfc0453a81d48
82 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0001

Heuristics 3

  • UNC path in PDF — possible NTLM credential theft (CVE-2018-4993/CVE-2019-7089) high CVE likely CVE_2018_4993
    PDF contains a UNC path (\\server\share) alongside action triggers — when a vulnerable viewer resolves this path, Windows may send NTLM credentials to the remote host as the matching PDF action is processed
  • Remote GoTo action high PDF_GOTO_REMOTE
    PDF references an external document via GoToR/GoToE whose target is a URL, UNC path, or executable
  • 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 \\10.247.65.226\security_updates In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0XIn PDF document text
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0In PDF document text
    • http://www.microsoft.com/pkiops/crl/MicCodSigPCA2011_2011-07-08.crl0aIn PDF document text
    • http://www.microsoft.com/pkiops/certs/MicCodSigPCA2011_2011-07-08.crt0In PDF document text
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0TIn PDF document text
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0In PDF document text
    • http://crl.microsoft.com/pki/crl/products/MicRooCerAut2011_2011_03_22.crl0^In PDF document text
    • http://www.microsoft.com/pki/certs/MicRooCerAut2011_2011_03_22.crt0��In PDF document text
    • http://www.microsoft.com/pkiops/docs/primarycps.htm0@In PDF document text
    • http://www.microsoft.com/TypographyIn PDF document text
    • https://docs.microsoft.com/typography/abouthttp://lucasfonts.comMicrosoftIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4C 75276 bytes
SHA-256: b51d987cf951ff1e2a9c72319a9c72c3af3c11d9c8afcb77d6eccda496e60e3a
font_01_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 81740 bytes
SHA-256: 8968d311fdd8ca6aefb490943eb49835e5a3d5766af51f30fd96e38a9d4f0ea2

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