Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85a5af106ac8981…

MALICIOUS

PDF

74.2 KB Created: 2021-07-17 15:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb2dcbf7ebaf1c57606ccd7c6c2f4a21 SHA-1: 9269077474b7657e5a96ab64551129cb2e0f32ce SHA-256: b85a5af106ac8981e83052ab831b189b47e3a1f646af468e820a10be8f635205
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. The 'SE_INVOICE_LURE' heuristic indicates the document content is designed to resemble an invoice or payment request. While no scripts were extracted, the presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2592

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/~3/5VO7y1TeAqQ/square?utm_term=for+your+perusal
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec83dc4a8bde38c344e744/1626112988696/total_number_of_orbitals_associated_with_third_shell_will_be.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ea59f492d21a0f684f9b/1625877081747/how_many_days_does_goldfish_eggs_hatch.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_off0000c66d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 16792 bytes
font_01_sfnt_off0000de7f.bin
b6195db613e3b5ceac64bc3cc77fc91391887da4f2976689c194f8d785cb4394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 15800 bytes
font_02_sfnt_off000106de.bin
227e6b0149af2e2d1adb4eefe994b99ed5ac05cf9d2df442fb60e992bc33a159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 10144 bytes

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