Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5e520303dc134f…

MALICIOUS

PDF

78.3 KB Created: 2021-07-18 07:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a867cdf7e0f6c20ca05009fdffa99a70 SHA-1: fd065b0c1d670e4b9bbc6a0325f35cd6ec5f0f7c SHA-256: 8d5e520303dc134f086e675a4292e079416c4692961846ccb4dd5eb13c6fcf80
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URL that leads to a page disguised as a demographic questionnaire, likely a phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

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/sq/ugae/~3/-7-cX3opz_8/square?utm_term=demographic+questionnaire+for+research+doc
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f29edaa8f65e35b6d1ef06/1626513115041/10674976362.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f16b87347a2e2c840237be/1626434439486/ultimate_frisbee_unit_plan.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f147dbff43f80544538051/1626425307223/80413138974.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee0258f6d8087912c2831a/1626210904512/ministering_to_shut_ins.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f2340bb84a576e6cf52cad/1626485771391/manual_handling_operations_regulations_1992_wiki.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_off0000cfdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 16792 bytes
font_01_sfnt_off0000e7ef.bin
550dd095a2e7d9da7b46e60ad2599542f1b4c2de27e90cbe8ecd2c9e15d1a019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 16784 bytes
font_02_sfnt_off000113b5.bin
6d7e1259dacf68b12518641a26b6a1524d1bf37f2574776fab4639f9f1ba1535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 11268 bytes

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