Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a9d5101b9ecfdd…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 14:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58ca72285ffcab9db2af8232cdf4063c SHA-1: 0f7921113fd184df9eb8a26ab30bebbfb5a12057 SHA-256: f5a9d5101b9ecfdd4341f68ee8d034ba6e2737a31293476867e08e803330f9e5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user or download additional content. The obfuscated document body and PDF structure further support a malicious classification, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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/cEZ-xJcQpFE/square?utm_term=use+of+calculus+in+real+life
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8555cfd202e2b3169568f/1625838941087/zavowetijurokakikiwazinos.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e915048fb24157da6fa099/1625888004217/1696989112.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecacebe7718717d765f996/1626123500050/ares_file_sharing.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed361df9a98d6db3aafca9/1626158622071/amapiano_sample_pack.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e890250eaa7c19c9d75759/1625853990069/fatizadibuxuletola.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e56b2f3c4128e1871cab/1625875819188/xazogiz.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_off0000f3d5.bin
7e09c5574bf8e4b15fbefbd5127aa70417624429f39c3100c009fa915933219f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 17024 bytes
font_01_sfnt_off00012041.bin
e472551faf646c7e236fb2a8eb8020165b6fb618dd7725ebe4cfbe5c58a2914e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 10340 bytes
font_02_sfnt_off000137ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137AB 16792 bytes

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