Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d33771108e851c…

MALICIOUS

PDF

76.1 KB Created: 2021-07-15 22:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 575699768066ad560c79a160e62e718b SHA-1: 5d6220f475f5ad260f40fb42b4cf60be40355423 SHA-256: d8d33771108e851c15a43a472a45415db4ac9f2d260de064a151f110a9a0b7ae
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URI pointing to 'synerhu.ru', which is likely part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further suggests a lure to trick the user into interacting with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=can+you+change+a+word+document+to+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca0247a6a1626764b43b1/1626120228711/how_to_get_an_owners_manual_for_a_car.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e81d865eabb22f35dd3770/1625824646596/physiotherapy__health_clinic.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eff07fe4fb0f110d7ae093/1626337407491/gosusodatejenuguxupeneb.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_off0000c7a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A2 16792 bytes
font_01_sfnt_off0000dfb4.bin
9e8adced48624d32218ce3ef841f3e6e11302ab7d755d910b5c527d9845ae612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 16612 bytes
font_02_sfnt_off00010b07.bin
1b57c4385ec1676350de4e3074dc8fa6103fe3cf380e1b6f5a53ffaf11fdfaac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 11092 bytes

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