Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ab6873b6e6103c…

MALICIOUS

PDF

79.3 KB Created: 2021-07-13 17:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ada81ae8b1cbc9ca75c8e4a54473549b SHA-1: 54210a69faf7ab7d040446bfe339918ad15bc100 SHA-256: 21ab6873b6e6103c9f9a734e71958361e23ec8ce54f5e484fa3f936b9786f9f1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'philabc.ru', which is likely intended to host a phishing page or a further stage of the attack. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the presence of the malicious URI strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/square?utm_term=concerts+2021+near+me
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed5b33f77a3e4a90f3726f/1626168115946/73968077654.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecddcb9db072196a1a8d47/1626136011779/pokemon_black_and_white_gba_free_download.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94ed3854c1d3b34883bc2/1625902803160/10964209562.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_off0000d350.bin
f257e2853d0d6b77edba10a16fd7d29938e4e76eaaacf6db8f4f42be6c886617		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 17488 bytes
font_01_sfnt_off0001012e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 16792 bytes
font_02_sfnt_off00011945.bin
5f6b915019858425209edb5d08c24aebcc4ab187981ea3d468e5fb0546af5451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 10576 bytes

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