Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a576f26ee89e816…

MALICIOUS

PDF

83.4 KB Created: 2021-07-13 17:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16b3131bc98c4d3b74fb29d4de510bd3 SHA-1: 6b1c360e3e5d149358f09719c2692c1a56ccc167 SHA-256: 1a576f26ee89e81697cce6f23494275e4634afa7d6339aaa69ac50a231a97913
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs that likely lead to malicious content or further stages of infection. The PDF structure and embedded artifacts suggest an attempt to exploit PDF viewers or deliver malicious content disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5793

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/razvivatel/yapz/~3/XMoLd4EPXkg/square?utm_term=prothrombin+time+of+30+seconds
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7c5d11873c46ac9387987/1625802193266/the_great_indian_art_competition.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec88a04c0b954f9ea4b11c/1626114208730/introduction_to_marketing_strategy.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9410fe370ac632289e848/1625899279213/ambant_underwriting_services_limited.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecdd18b1b13d3c3c09c383/1626135833106/3_year_old_started_blinking_a_lot.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_off0000e30d.bin
e43f238881bb4bbb8782dffeac76276aad1666f49b4d03ab33c133cbfae3f683		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 10968 bytes
font_01_sfnt_off0000fc56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
font_02_sfnt_off00011468.bin
92687ab0dfc1d435cc684e1d10457d89ee5d55a91bb6dd9111e0d3bf0be94711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 18244 bytes

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