Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0b857249b3ae67…

MALICIOUS

PDF

79.0 KB Created: 2021-07-16 18:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34b3dbeba106cc6fd8e272a1b6ca589f SHA-1: 2e3c1e1a2c9ef2e8694cc350b1608b635b707449 SHA-256: ef0b857249b3ae670c4827c2c030f4b53e4fcb5bbea04aa3e0f43dcdeaa46774
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating a phishing attempt. It contains embedded URLs, one of which is flagged as a potential phishing lure. The document body is heavily obfuscated and appears to be malformed, further supporting the malicious classification.

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/sq/ugae/~3/7R6buoffwiA/square?utm_term=things+you+wear+that+start+with+r
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0f2e346c0d74f87dc464b/1626403556024/motusopiwatapim.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e93e62085b1c120f991e03/1625898594192/medial_lateral_ligament.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_off0000d22c.bin
b4045834274c4687ab07246088b7dac0955083e387786d5d03f958260ec25a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 17736 bytes
font_01_sfnt_off00010024.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 16792 bytes
font_02_sfnt_off0001183b.bin
a281901d906d8b7713a656f8532b113716df0d479ae64fc98d617ea921bb034b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 10604 bytes

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