Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fd049c5ace73b3…

MALICIOUS

PDF

78.9 KB Created: 2021-07-14 00:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 509b0b9e0cc74994ba73545385be40c8 SHA-1: 3af066c9381ce5f67c86aabf460661cc07e6f9a8 SHA-256: 21fd049c5ace73b3e836197fa27a1d95d92673e76cc8035b72af2cc813ed8842
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan'. While the embedded URLs themselves are confirmed benign, the presence of an external URI and the overall detection suggest a phishing or scam attempt. The document body is heavily obfuscated and does not provide clear textual lures. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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/~3/7R6buoffwiA/square?utm_term=brown+frogs+poisonous
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eded4ca4137771ba03b690/1626205516905/hypothesis_testing_in_statistics_examples.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee08607c5bce1f3348a536/1626212448327/41959295968.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_off0000d75f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 16792 bytes
font_01_sfnt_off0000ef71.bin
cc31b4fd769b0f49dc1e2e5d56d403c4b784b10d962739ad95008f42116775cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 15992 bytes
font_02_sfnt_off00011893.bin
882bf832f2bbda9f7cc838c417ea0160401921692aa813270807ffa9bfde3c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 10332 bytes

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