Malicious PDF — malware analysis report

Static analysis result for SHA-256 763554542edf2417…

MALICIOUS

PDF

73.8 KB Created: 2021-07-13 15:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8975bc9a66784c6f2b877cfe76751e24 SHA-1: 7120413736e694135ea2ac6a8c271c6af97e1edf SHA-256: 763554542edf24178279ce73de9294c785018a6cc149b5b6d3040fabe9d172ea
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan behavior. It contains an embedded URI pointing to a URL that, while currently marked benign, is suspicious in context. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of embedded URLs and the ClamAV detection strongly suggest a phishing or credential harvesting attempt. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier clean score 0.2277

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/hIkXU_AiHkM/square?utm_term=formative+assessment+question+papers+for+class+7
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e869f1cb038805fe1db935/1625844209595/22852843767.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec91907dc7460dd09becd0/1626116496852/xoxilaruworopimupi.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_off0000bd1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1B 16792 bytes
font_01_sfnt_off0000d52d.bin
fb9b022e57d11a91df5e31f5adda27749c58d09c99f4da7dd323860f16e518b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 16276 bytes
font_02_sfnt_off0000ff65.bin
24836b25fe358fe42c35ed37a760dc670cca59266279e24e2ac5185dd4f21e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 10980 bytes

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