Malicious PDF — malware analysis report

Static analysis result for SHA-256 893d2722721526c1…

MALICIOUS

PDF

71.2 KB Created: 2021-07-12 22:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bea13275c2c64447ab83e11ccd3c913 SHA-1: 8c8abe7c8a73e5ee0244a2a5397c549e8d6b64f4 SHA-256: 893d2722721526c177ae14c123e66d43e7882f730569c05f5b5606c22a0cffd1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URI pointing to 'crewmak.ru', which is likely a phishing or malware distribution domain. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.2209

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/square?utm_term=how+to+open+word+document+without+password
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e77000463f933081ef7463/1625780224659/28_day_weight_watchers_meal_plan.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ff42b132fa362071e6a9/1625882434732/kesepaxukodagegitilig.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_off0000ba08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 16792 bytes
font_01_sfnt_off0000d21f.bin
c174d651a6e91d62659f280beef4df4b83aca59f092bd0a9396af53414a3da41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 10912 bytes
font_02_sfnt_off0000eb30.bin
5df685834081284a2bc7c4784d1fa1cb3fb4177195b13a16f52915a3219a868c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 14956 bytes

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