Malicious PDF — malware analysis report

Static analysis result for SHA-256 a112006ee8a39a4c…

MALICIOUS

PDF

78.6 KB Created: 2021-07-18 14:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5016ba3414c7919fe6f05368f2ceb371 SHA-1: a211c4d1e231a0cc8152e5e4d2de67862c4359af SHA-256: a112006ee8a39a4c0b84c1a4ee9a608e62fc7c43e1e8d0ba68b32cfb8c00d731
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 phishing trojan. While the document body was heavily obfuscated and unreadable, the presence of embedded URLs and the ClamAV detection strongly suggest a malicious intent, likely to lure users into a phishing site or download further malicious content. The file's structure and embedded artifacts are consistent with known PDF-based malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier clean score 0.1658

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://feedproxy.google.com/~r/sq/ugae/~3/jEScUJLm1bs/square?utm_term=no+cramps+during+period
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0dcfcc825a553dff0b2dc/1626397948191/jcpenney_store_closing_list.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edefc4a0f2ca3483d3f59e/1626206148254/cell_cycle_science_skills_answer_key.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_off0000d277.bin
2f68ddf38ecdf777600aa855703e3adb2a6f08c5c5b7c078cb08f4cf2086bfe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 10792 bytes
font_01_sfnt_off0000eb14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16792 bytes
font_02_sfnt_off00010326.bin
a3a80a5fb88c4a8cc63342fb6c40276ddaa4d672aea4d496e656b227894be73e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 16364 bytes

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