Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66085f4b77c6a82…

MALICIOUS

PDF

80.6 KB Created: 2021-07-13 21:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e87ee7c9c2e3a5d22b785247f2127dc SHA-1: ee291dd4a90fcd81a945d1649646d22580f1e9ff SHA-256: b66085f4b77c6a827e6f8aedfdca79b3098f19e78bee593553c5dacbd40fbc7f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a critical ClamAV detection of 'Pdf.Phishing.Trojan'. It contains an embedded URI pointing to a suspicious domain, likely intended to phish users. The PDF structure itself does not contain readable text, but the presence of the malicious URL strongly suggests a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8584

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://philabc.ru/square?utm_term=one+survivor+remembers+questions
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e93bd3fc46b1505828e8ba/1625897939518/tejovapix.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e89c87f5b8673b9fefddef/1625857160043/54591525500.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7fbbb69e16759cf76fad6/1625815996085/i_shudder_at_the_thought.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec88f2bdd82073f6ffb434/1626114290356/when_do_you_want_to_see_me_in_spanish.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93da18fb24157da710792/1625898401313/21655028643.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd28f4ff81d3e2812be55/1626198671649/frozen_coloring_book_pages.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e779fbcf132e35f054a587/1625782779151/29026309408.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_off0000d6df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
font_01_sfnt_off0000eef6.bin
3a37017748cd5d11dc255b0a8610318502befba5e6398ea386baf3ccba9a1ec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10536 bytes
font_02_sfnt_off00010706.bin
b08a2444160d9875e7d34907521a45bf415b84398995d07f6f5aac006d24b3a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 18064 bytes

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