Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9c8a05b8076828…

MALICIOUS

PDF

81.3 KB Created: 2021-07-19 04:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d8d17608b716d03b77fa8ba2ffdffe7 SHA-1: 2c28018e186a49a49824acdb15d5eb22426c2124 SHA-256: 8b9c8a05b8076828428eed539c0d29891be4089f60b2d43820f866781a68361f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ClamAV heuristic identified this PDF as a 'Pdf.Phishing.Trojan', strongly suggesting a malicious intent to deceive users. The presence of embedded objects and external URIs, even if currently flagged as benign, are common components in phishing or trojan delivery mechanisms. The file's structure and the ClamAV detection point towards an attempt to exploit vulnerabilities or trick the user into executing malicious code.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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://feedproxy.google.com/~r/razvivatel/yapz/~3/IdU8rIDf9lQ/square?utm_term=great+old+hymns
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8e3222210ba6bce0ec897/1625875234416/pokemon_sword_and_shield_how_to_evolve_eevee_into_sylveon.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94fb8f4fe78435a3c2045/1625903032715/12710250445.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_off0000de63.bin
97e82abccfb73eaabe94ff7d97d451637fbfc746a1319e7c3b7a1c4a95ab1162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 16924 bytes
font_01_sfnt_off000109f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 16792 bytes
font_02_sfnt_off0001220a.bin
fb299e685210488c8292faa9b886cb8a76aba9380698dbf8d917c17e9dd7c6d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 10572 bytes

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