Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea73d8150337e5c7…

MALICIOUS

PDF

75.1 KB Created: 2021-07-15 23:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ff8fcba287b25adeb1048a309077297 SHA-1: 7f3ca08d468ec1f529c96e929b2f2af2b19d6295 SHA-256: ea73d8150337e5c74015f633529a89d5b32d8ec199f1b01eb1e5418f79bfff38
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to external sites, likely for phishing or to download further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern points to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8028

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/sq/ugae/~3/IdU8rIDf9lQ/square?utm_term=sinus+infection+and+bloody+nose
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e81562adf2c2688202d58e/1625822562193/78068207701.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee293b115d504d3a84ca36/1626220859099/48767509655.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60efecb6fdf156014349aa16/1626336438786/10247328743.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_off0000c6c4.bin
c5e237948b7aa13fc0bd2a0df77d23e6fc43a35700311a53d3fe1959e2964772		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 15912 bytes
font_01_sfnt_off0000ef80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16792 bytes
font_02_sfnt_off00010797.bin
27b8008ad81e4cc202c973c3ecd218a0422ac2bfcd615e1039e5a7615f4a1e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 10796 bytes

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