Malicious PDF — malware analysis report

Static analysis result for SHA-256 2630ddffcfea160c…

MALICIOUS

PDF

85.4 KB Created: 2021-07-18 01:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 136e336204c58e7254e1a997410c87fa SHA-1: 263a23216112e7c13fc5bf66f2092687b71761cb SHA-256: 2630ddffcfea160ca24580c16ba70c6526a7d6f3211c9ede0b57342da12ca03b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that has been flagged by ClamAV as a phishing trojan. Heuristics indicate it contains external URIs and attempts to lure the user into revealing sensitive recovery secrets or private keys. While no scripts were explicitly extracted, the PDF structure and ML classification suggest malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

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/sq/ugae/~3/jEScUJLm1bs/square?utm_term=introduction+to+cybersecurity+2.1+chapter+1+quiz+answers
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e76a01de99cf29ad213944/1625778689405/muscle_and_a_shovel_heresy.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f3283927519501fc0fb11a/1626548281562/88784093324.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f34ead731d8c7c6ffd07fd/1626558125819/ford_puma_owners_manual.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93da18fb24157da710792/1625898401313/21655028643.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_off0000e901.bin
3a370c4b5a2f23b6c59ff1663655c4e2119ad8f9b965b01fb3eabf3957e52e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 11400 bytes
font_01_sfnt_off000103a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
font_02_sfnt_off00011bb9.bin
37d7bb4c35f3dc6aca2895f27b581b8fe35188a37bdba6a98c31cac0f1964f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 17532 bytes

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