Malicious PDF — malware analysis report

Static analysis result for SHA-256 c538fefc0c41dbf8…

MALICIOUS

PDF

76.8 KB Created: 2021-07-15 12:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80530f03f5d71567b175bd4eeb6f2c4d SHA-1: 6d9c39180cd5411bf3e716c2fc03e83de13eeb8b SHA-256: c538fefc0c41dbf8fe4ff917d7035bad3e5b80e2fc44e9fd7aaca6d5a01d9c5e
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan, indicating a malicious intent to deceive users. The presence of embedded URLs, though marked as benign, suggests an attempt to redirect users to malicious sites or download further payloads. The PDF structure itself may contain exploits, leading to client execution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3002

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/sq/ugae/~3/4aHNpQc2m6I/square?utm_term=the+second+conditional
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e937fd2a6f785f58351c6a/1625896957365/insert_pages_to_word.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee5557588fb5669516379d/1626232151332/learn_to_draw_realistic.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_off0000c9c3.bin
588bb7d12190c8aa7a4926e94b48cc536a716f888f7a6ef6ff28ec56786d79e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 17448 bytes
font_01_sfnt_off0000f6dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 16792 bytes
font_02_sfnt_off00010ef3.bin
6f2ed894fd71ce73eb5736d4d804ed56b3275bf04c94b5613e23d5030e362bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 10332 bytes

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