Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf19b5e6b993609…

MALICIOUS

PDF

76.1 KB Created: 2021-07-13 19:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7ab5e5edc58191348fcf24db8daafe5 SHA-1: 8f08dd036ae12b1b3b0d4ada66ecab046bb85c58 SHA-256: 8cf19b5e6b9936098c154778bd5429c43186af57f7182ec475d4a94e4a160356
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a phishing classification. It contains an embedded URI that points to a URL which, while currently benign, is part of a pattern to redirect users to potentially malicious content. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, likely to facilitate phishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2580

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/eaN1Eb74jJI/square?utm_term=coumadin+and+heparin
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e835d74261ba798064cf83/1625830871573/14569580276.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e865d5a478d45534d01bcb/1625843157914/xaban.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_off0000c74b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 16792 bytes
font_01_sfnt_off0000df62.bin
8d5f77dd91aad2281cf0d4aeb6e60fc79f079a7eb9ef57d2735f93be72389306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 10476 bytes
font_02_sfnt_off0000f6e1.bin
40d8a3fb0443cfac1f0752d726264d83cf8994d9d4b838d938232c639c3b5949		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 17000 bytes

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