Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffe42dc036a3a21…

MALICIOUS

PDF

86.3 KB Created: 2021-07-16 06:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e525b528ac35f55110a96cbd9586b585 SHA-1: c84201ac35309f024129e68aea71615abd796c14 SHA-256: 4ffe42dc036a3a21f594b04c3a4afe9bc4ca745fda332962a9aaac42334e4b7e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an external URI and a lure for password-protected archives. The embedded URL, https://ketchas.ru/square?utm_term=eclipse+roleplay+quiz+answers, is likely part of a phishing or credential harvesting scheme. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest an attempt to trick the user into downloading or accessing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=eclipse+roleplay+quiz+answers
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7fe3dd2ac847ff7e420f/1626111971346/100_rmb_to_sgd.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8356395719b356d968f2a/1625830756080/the_meaning_of_incomplete.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e1ed27127e68041263ea/1625874925591/whether_and_if_difference.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_off0000f310.bin
307fa550ba80c9ba33692d434cfa7e15907c5571988d152ca1eadb82a0b36682		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10760 bytes
font_01_sfnt_off00010c04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 16792 bytes
font_02_sfnt_off00012416.bin
1cf7f9b62f9212771233bf0f72ab0b249e51e0cba5b062d3f3781b2ba70607bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 16140 bytes

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