Malicious PDF — malware analysis report

Static analysis result for SHA-256 188cb5d36998be42…

MALICIOUS

PDF

79.2 KB Created: 2021-07-14 09:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5fc3fec4fbcedc28855fc14eb6de525 SHA-1: 35ce66e1ddfe913d566e8eb96833452e63dc5730 SHA-256: 188cb5d36998be42895390cecbeec4f196b3f8cb97f7508ef6eac710b3e3cd5b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'synerhu.ru', which is a strong indicator of a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

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://synerhu.ru/square?utm_term=adverb+clauses+exercises+with+answers
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca4633080d76c7a53fcca/1626121315206/wekigolunenutadetexuzid.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ede33ad6ef6771c1dc777b/1626202938778/facetime_iphone_6s.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e822cc25441e1b3788cc29/1625825997016/zurabadijiwaxobagaje.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7dc8efdc75e32ab079ad3/1625808014263/differential_and_integral_calculus_by_feliciano_and_uy_complete_solution_manual.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8e78caa30721e65ec0ed7/1625876364550/fowegajexusositetowakodod.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_off0000d2f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 16792 bytes
font_01_sfnt_off0000eb0f.bin
92549b126671490a9327657fc0c67eceb28ef41187940e937135b144fef7e56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10820 bytes
font_02_sfnt_off00010406.bin
2ab717a22fcc7273022c281c79f66b06a310c6c49e020a7ff5f254329182e1ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 17280 bytes

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