Malicious PDF — malware analysis report

Static analysis result for SHA-256 412b4b86f90e6e6c…

MALICIOUS

PDF

86.9 KB Created: 2021-07-17 15:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2048fa9c206a123ff646671b3001ce3 SHA-1: 1d64cfc896c90596c1f363c39bec8cc974ba0030 SHA-256: 412b4b86f90e6e6c9794580cea0dbdae67cbf5be5ff93d3a91bd2ccc53ced6e0
66 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. While most extracted URLs are confirmed benign, the presence of an embedded URL and the nature of the ClamAV detection suggest a phishing attempt. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier clean score 0.1630

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/razvivatel/yapz/~3/XMoLd4EPXkg/square?utm_term=psychological+theories+of+deviance
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7e05f80504e0a7769aa41/1625808991318/ccna_notes_free_download.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_off0000f206.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 16792 bytes
font_01_sfnt_off00010a1d.bin
f12f2f3e04637831226d551e978e923d37bb329b71ab076225f698427b281c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 10936 bytes
font_02_sfnt_off00012347.bin
44ff3bf44d56e765435d632d9a9a10499dc854c18c03b00c2db33400827dc30e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 17200 bytes

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