Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac74050e10479f3a…

MALICIOUS

PDF

74.2 KB Created: 2021-07-13 19:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40761587107d80ce20fd2e3ff72fa9eb SHA-1: 52f69e2583b4a3092368042f7fae2bb9830424cf SHA-256: ac74050e10479f3a25173882733bded880f4e474005e392d3438d1afa39b6da2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. The PDF contains an embedded URI that points to a URL, which is a common tactic for phishing attacks. While the specific URL is marked as benign, the presence of the embedded URI and the ClamAV detection strongly suggest a malicious intent to redirect users to potentially harmful content. No scripts were extracted, limiting further analysis of the execution chain.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2592

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/nCRFBnYrBHY/square?utm_term=bury+your+face+in+someone%27s+chest
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b655fdc75e32ab05a27f/1625798229114/chrome_web_store_internet_download_manager_extension.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eda562ac23c31e62fdf569/1626187106671/sonic_unleashed_wii_rom_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_off0000c541.bin
2bd860401334aee638aab8423ae81aea0baf93a812276cb0cdb50129dfbf8984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 15260 bytes
font_01_sfnt_off0000ec20.bin
4f8af91d62e30036adb08bc553a56d3e9cec044385c72b39df4bdc004a0583da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 10856 bytes
font_02_sfnt_off00010528.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16792 bytes

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