Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a8c00d0cf4a6fa…

MALICIOUS

PDF

80.9 KB Created: 2021-07-12 22:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50ceaafbb3665bbaea647b9b6dc33841 SHA-1: 918c07fab910c3c4f18dd0a5a138b163bb069963 SHA-256: f9a8c00d0cf4a6fa6e1f49fb26466a71e03ad4413a92527f0122945d449dc904
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL pointing to 'catamma.ru', which is likely part of a phishing or redirection scheme. Although no scripts were extracted, the presence of the malicious URL and the detection signatures strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8554

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://catamma.ru/square?utm_term=encrypted+phone+meaning
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8dfb7c0906550d907b2c5/1625874359517/6_month_premature_baby_survival_rate.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e93eecc0906550d90c2194/1625898732234/past_continuous_and_past_progressive.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e88ed3de22c5085b97b747/1625853651958/midogemo.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94884b68d8f0f4bf980b2/1625901188912/thinkin_bout_you_rod_wave.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e94d47e6bd1231e6094a6c/1625902407730/on_superstition_by_ag_gardiner.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_off0000d96b.bin
99db995ccc6aa98266cde7328e381f9d65ccca4cdc8a462c9d24dddcc5aa3d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 17000 bytes
font_01_sfnt_off000105e8.bin
d68bad70a1193c5d6e57a3aacfde6f5364c94fc994a711019255d8ff498b197e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 10844 bytes
font_02_sfnt_off00011e86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 16792 bytes

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