Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87cbe91a80236c2…

MALICIOUS

PDF

80.6 KB Created: 2021-07-13 23:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c2b474b0df4b0aa8aa50b173f5046b8 SHA-1: 9a5f18f457e0f3f787516a1eef8463b4a98edb60 SHA-256: a87cbe91a80236c259e516569c14134581cf312e7f70ac4e5337889a220c6877
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, though many are confirmed benign, suggests a potential phishing or malware distribution vector. The PDF structure itself contains obfuscated content, and the authoring application 'wkhtmltopdf' is sometimes used to generate malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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/razvivatel/yapz/~3/gOBB6uaVNRA/square?utm_term=the+giver+chapter+3+summary
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edee2fd6ef6771c1dd977d/1626205743288/47633029435.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e87424440f2d3b488c4daf/1625846820422/75992109190.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e89c87f5b8673b9fefddef/1625857160043/54591525500.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_off0000dedf.bin
0f95f3f2847dbb9471e15d6a30567f02074b9650cb59ef301767bb03c1150fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 10968 bytes
font_01_sfnt_off0000f871.bin
584b446ba03ec238e53fa6129a2a0f657d2b0540756f98ce0c035b888ea2eb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 15080 bytes
font_02_sfnt_off00011ea1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 16792 bytes

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