Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac76ae9c796f55f2…

MALICIOUS

PDF

77.1 KB Created: 2021-07-12 22:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43ce722472ed36f609ae796a43f0399a SHA-1: cfd23db6679a8ba060d061c0828ca7eebec3ce6c SHA-256: ac76ae9c796f55f2749146df519119e1e154e39f72e108da13b6193d297d1de5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URI that points to a URL, which is a common tactic for phishing lures or directing users to download further malicious content. Although the specific URL was flagged as benign, the presence of the embedded URI and the ClamAV detection strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.1551

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/hIkXU_AiHkM/square?utm_term=bottom+of+the+stairs
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8462d8d23a90293b188fc/1625835053077/interior_angles_of_a_polygon_worksheet.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_off0000cf4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 16792 bytes
font_01_sfnt_off0000e761.bin
9a8db9aeca2a124674bf7cc8bc440ef634f63073240dd6435ae772009f24532c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 16304 bytes
font_02_sfnt_off0001119f.bin
4d94db7d7014512a85992c67b2233d388881079fbaea340d5bd4fdce302841ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 10380 bytes

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