Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d7d4f1ab82fe43…

MALICIOUS

PDF

74.7 KB Created: 2021-07-20 07:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 383dd4a933e236578488e3bba2b33ae1 SHA-1: 3cc540ee6f2077600f602bd772c414a0039f3da2 SHA-256: 90d7d4f1ab82fe4394669e01b364779ecf4f16b61c46ed9986aae7e5ad33c6b2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs, one of which is a feedproxy URL that could be used to redirect users to a malicious site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of embedded URLs and the ML/ClamAV detections suggest it is designed to trick the user into visiting a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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/UZrB20b2Dcg/square?utm_term=ocd+and+related+disorders+dsm+5
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3a9d31434f63547283466/1626581459206/kuforutivimimaxavotojefi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7ab4751cb2a526cfa1328/1625795399962/19348274270.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0fca48ed7c6554e796688/1626406052801/wanasirujoxalopud.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8ce36cb474813b85b6f76/1625869878733/79507868975.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8dd0cd1a1204f6c8e255/1626115536559/accessible_to_everyone.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_off0000c37e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC37E 16792 bytes
font_01_sfnt_off0000db95.bin
7c03222503586bbadd7a09deb9845936cdbc29d17ed2b33994941e7911a3b164		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 10692 bytes
font_02_sfnt_off0000f41f.bin
ba03d351339a7fc20bbf0c0d5df083e89439b10f21a72b16ca0912e16ae5aaa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 16524 bytes

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