Malicious PDF — malware analysis report

Static analysis result for SHA-256 e858c9a260181c65…

MALICIOUS

PDF

76.9 KB Created: 2021-07-20 21:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 436f7781174b8ee57faa0190d9862a98 SHA-1: e085ec8e5c46709ea37307e2cb82d6d7a7104a0e SHA-256: e858c9a260181c659ff64734a8b64fc165215cfe072488c7fe16872d22eefdad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URI that points to a URL mimicking a courier tracking service. While most extracted URLs are benign, the presence of this specific URI, combined with the ClamAV detection and ML classifier flagging, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of the exact payload mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5122

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/X6hrLWyzjlw/square?utm_term=aviral+courier+tracking
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f30cc87e0b4d5f6b175dea/1626541256387/dominic_monaghan_wolverine.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e83cf4a9c4294aacf55071/1625832692331/meaning_of_ambitious_in_telugu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edf14a172ba47bdac5d1b4/1626206538401/forge_and_farrier.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b713.bin
1d7adfabcd8fd80815994c381ad6261571a99b94758b558c093df5aa6bbe94dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB713 15696 bytes
font_01_sfnt_off0000df74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
font_02_sfnt_off0000f781.bin
83b53068b9f36914ac6411ea243cd37fc5a0470cf6e8b7872acc5c5a4dff8494		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 6768 bytes
font_03_sfnt_off00010e40.bin
35ff171aa5ad4b6faea5fc0639c91bf8eb691e43d5c809b26475d7342ba589f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 10476 bytes

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