Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9653b34734f6838…

MALICIOUS

PDF

82.6 KB Created: 2021-07-12 22:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a0be5516b4aa959cd5de6a6d2766428 SHA-1: febf1e4980bebd7fa0ea36218d1a322c46676762 SHA-256: b9653b34734f68386f7c364e60c038e85ce6585c88c7bdb263ecb285419c4f1a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs, specifically within the document's metadata, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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/razvivatel/yapz/~3/-MXWpcYQ7kA/square?utm_term=5+points+of+modern+architecture
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9118a025aa46e30d22829/1625887114523/sosix.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7ea8f89f8e700bf6e2ea/1626111656738/82561452973.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e81adbf29cd6423db6e3e6/1625823963303/24331619932.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_off0000dbf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 16792 bytes
font_01_sfnt_off0000f407.bin
d68d5edf6808259cc77df727ad25a8dc2d1713a3551363f4a7963a2f2e55089e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 10976 bytes
font_02_sfnt_off00010d54.bin
6b00bdeb57192b0d39125aac20f3bd60bf3349d16aed2967ada562ff51c23c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 18812 bytes

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