Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b5ef23789bee15…

MALICIOUS

PDF

77.9 KB Created: 2021-07-18 01:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e125a4f1abd264ead0bbfc48c848adaa SHA-1: 14dcff1867fec9eeb46781d76d4178346417dc98 SHA-256: f5b5ef23789bee153720df8377e8e99ef85717bb5b32edc9ae286dd9a70f6db4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an embedded URI. Although the document body is heavily obfuscated and unreadable, the PDF_URI heuristic points to a URL that is likely used to deliver a malicious payload or conduct phishing. No scripts were extracted, but the nature of the PDF and the embedded URI suggest an attempt to trick the user into navigating to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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=planting+courgettes+in+pots
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edc3e36f11847873594d5d/1626194916063/21351408443.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edf9c63be50f2c5db08a70/1626208710819/empty_paint_can_disposal.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f34f3781f38b205886d269/1626558263540/sql_update_two_values.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1624e8bcf896c91617253/1626432079070/16113793016.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_off0000d02c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02C 16792 bytes
font_01_sfnt_off0000e83e.bin
1c11f2a0cde3d6598c237c182568d84404193412a6f0033ff8e8bb1a0ce9d7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 16392 bytes
font_02_sfnt_off00011343.bin
e72baceea6f2ed812dc4b71aea9af9ec5bee7917f5fbaef76bd66bdbd318f421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 10652 bytes

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