Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f474c7d353681e8…

MALICIOUS

PDF

75.8 KB Created: 2021-07-14 03:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef55e6bf733345c7d2ba0cb0b784457e SHA-1: c1edb1499a39851e78daa445b7e450283a7ecec7 SHA-256: 8f474c7d353681e83a58ce0172f3b6cc65187f7f5b58178c33564a527bea7a86
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan', indicating a malicious intent. The presence of embedded URLs, even if some are marked as benign, suggests an attempt to redirect the user to potentially harmful content. The file's structure and the nature of the embedded URLs point towards a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/UZrB20b2Dcg/square?utm_term=proverb+stories+in+tamil+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee19052a4cda17625b6779/1626216709683/open_mind_2nd_edition_level_2.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e90450aa30721e65eddd81/1625883728622/xivenetaf.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_off0000c62a.bin
f2c51f3e5712179a11b65b6608af27e8bf11b4a09c7904fb28424a6619ceac9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 10868 bytes
font_01_sfnt_off0000df0c.bin
5356d2244b50c8384615d4f3d0d55cebb7505afb37728e93a145c1cc359617a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 17108 bytes
font_02_sfnt_off00010b8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 16792 bytes

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