Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05a5e3a89d69ac4…

MALICIOUS

PDF

78.6 KB Created: 2021-07-21 14:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dc072960537e6ca887fac5771194581 SHA-1: aa36196179c761408c9cdc894b5412e99314b2a4 SHA-256: c05a5e3a89d69ac4ec7c458c0ea002a64f44cda5dec1a8ca40fc432bc32ef862
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The presence of an embedded URI pointing to a Google feedproxy URL, which in turn redirects to a Squarespace hosted PDF, suggests a phishing or malware distribution attempt. Although the document body is heavily obfuscated and unreadable, the heuristic firings and the ClamAV detection strongly indicate malicious intent, likely involving a lure to an external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6006

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/W5vEtEh6t-A/square?utm_term=hieronymus+bosch+the+human+abstract
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9066d8ce0e10532d1b671/1625884269390/93101980826.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4c2da1434f635473461ef/1626653402910/71020223952.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f331a79c7c9f0ea998e669/1626550695864/solving_quadratic_equations_by_factoring_worksheet_answers_with_work.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_off0000c14d.bin
43a727039652f57d0aeba722e3a96dae4f72b0b75dc35d2b724ddcf2b68aae11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC14D 10792 bytes
font_01_sfnt_off0000da01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 16792 bytes
font_02_sfnt_off0000f213.bin
d2b4d62d58fcdfeccacb24be943275c438a3fd42bc1138e4a4690376ce908ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 23960 bytes

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