Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0f10f57d7db3e8…

MALICIOUS

PDF

78.3 KB Created: 2021-07-13 23:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1038fcd9b53b64d85994970b667561bc SHA-1: 556a4c7d1102f6c2f2418da0e6ee2d5974f728b6 SHA-256: 8f0f10f57d7db3e886ad30c473f010439fb91dbc0ea71142e426b82e2de4e9c8
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a callback phishing lure, prompting the user to call a phone number, likely for a tech-support scam or fraudulent billing. An external URI was also extracted, pointing to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/square?utm_term=low+cost+cat+spay+and+neuter+near+me
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed4ddf37bee829a287eddb/1626164703661/64504617810.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ede48bcc8e436e4665ff5e/1626203275783/22233753181.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edb2a20999c45203744ca2/1626190498365/vekolonazomunigogoripa.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_off0000cdc4.bin
9a8a7152c94a75da7c0b354524515e179321b8ceec076e770fcc8ba244c3d282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 17704 bytes
font_01_sfnt_off0000fc97.bin
152b7d212cd8846ea20fd8a80ee5f928b8b4cb3e494487f129fae21f5aa044e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10792 bytes
font_02_sfnt_off00011593.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 16792 bytes

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