Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8742022973c1fd…

MALICIOUS

PDF

177.3 KB Created: 2021-07-16 17:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e76d97aa5799ecdeaa2bcab111917544 SHA-1: e3518218e9a5a9d9c13929b35e82a1693a7d55bc SHA-256: ed8742022973c1fd51e369194003045d00a2509de8b2474ea9f3848e0436f4ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a phishing lure, specifically requesting recovery secrets or private keys. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to deceive the user. The document's content, though heavily obfuscated in the provided excerpt, is likely part of this social engineering attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4570

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/IdU8rIDf9lQ/square?utm_term=computer+networks+5th+edition+solution+manual
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e0ecc91b61347ea03b9d/1625874669057/92524191552.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee63858685745b7d176442/1626235781452/sijubo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee24c8eed6cd77ab60435d/1626219720336/kiketinonor.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0a56e2d689d6a7ff2704f/1626383726785/text_italic_in_css.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec80f14a8bde38c344946f/1626112241574/44095974692.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e843689a03552a3d3835c6/1625834344862/nanisir.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_off00025299.bin
c8488b1702e91e5f9d0c21d8541b0d7ec0fd8d599997702222d8930297174896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25299 19244 bytes
font_01_sfnt_off0002867b.bin
71388accdb0bff8e2ed54f118d07df7cefa3bf6100418e8b2b75d988a901c534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2867B 11100 bytes
font_02_sfnt_off0002a04a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A04A 16792 bytes

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