Malicious PDF — malware analysis report

Static analysis result for SHA-256 656f99fcb2d658c1…

MALICIOUS

PDF

75.0 KB Created: 2021-07-13 17:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 450ee8f00e31c0a06b865390520c424a SHA-1: c28a7586c7f3752c74378ce6454de372d8d6e4cd SHA-256: 656f99fcb2d658c159b1356ed1cd03716c2b303b47942b9a50a88ed6c14c0b8e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of the malicious URL suggests an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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://ketchas.ru/square?utm_term=kindness+is+so+simple
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecfe0c37bee829a2844a82/1626144268677/92596997775.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9b975d4dee687f485af2/1626184599738/5052202359.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec823a0cf33f708d7a46da/1626112570821/apa_referencing_7th_edition_website.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_off0000c6f0.bin
e4bec114c1d35645a691d76cd03d5677ffa7d46629dde7991cd26f858519808b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10184 bytes
font_01_sfnt_off0000dd9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 16792 bytes
font_02_sfnt_off0000f5ac.bin
c38e52b63007e97774eac74071511a1539e8441e03a1307b24a1ca4f38f78814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 16576 bytes

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