Malicious PDF — malware analysis report

Static analysis result for SHA-256 381f5ebe241acc9d…

MALICIOUS

PDF

73.6 KB Created: 2021-07-17 12:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d252b3b1b551ea005ab9cc494880b55a SHA-1: 465666886bb825524dbe440a0a721ed35e2b835b SHA-256: 381f5ebe241acc9df876902af9b083c982f01e01e0ee49da49caabde8b4f5cfc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which is associated with a heuristic firing for an external URI. While the document body is heavily obfuscated and unreadable, the presence of these indicators suggests the PDF is designed to lure the user to malicious sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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://feedproxy.google.com/~r/razvivatel/yapz/~3/kVSxLQpkboc/square?utm_term=geometry+plane+and+simple+1989+creative+publications
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e919068ce0e10532d27f5e/1625889030364/79678844692.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f02134b37dc55b03519787/1626349876215/hugh_laurie_emmy.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0585fe9d32178dd76a76f/1626363999325/40122635469.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_off0000bf96.bin
06252540572a42ffeb395e6dbc1f2ec1659b961fae323cce6750178789a6b7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF96 15472 bytes
font_01_sfnt_off0000e724.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16792 bytes
font_02_sfnt_off0000ff3b.bin
b2a4b26fa4a962717e42f76bd2668d132004ebff1f4dbf87bc63114096bbc728		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 11560 bytes

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