Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bf593caf1ea49a…

MALICIOUS

PDF

88.6 KB Created: 2021-07-14 10:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d6a022fa3978d8a9feaee55ca97f25d SHA-1: 5bc100c5c2498d4bfc48f10f0d9c8e1dcf50e005 SHA-256: a8bf593caf1ea49a7968ee9af5f337173343a1ba8ad6fce7af1257c1ef3a4200
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The embedded URL points to a suspicious domain, likely a phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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://archism.ru/square?utm_term=5+steps+of+success
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e790db80504e0a776522ba/1625788635328/chapter_7_memory_psychology_review_worksheet_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e94f192dabf2723555ca4f/1625902873920/xujarubajasopunetil.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_off0000f9cc.bin
963565ccb651a89f33b9136389e6798a2911877f0a6278c0bd0fac93df1a322b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 17648 bytes
font_01_sfnt_off0001284f.bin
9b40e7c6a3394ee3b1421f041f7985e1fb80ae18e50362496a31cabc0cdc52df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 10104 bytes
font_02_sfnt_off00013f10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 16792 bytes

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