Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb389aefcf2e4093…

MALICIOUS

PDF

83.3 KB Created: 2021-07-17 18:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79b02ef79bd7dc6e10a993bf75a9d930 SHA-1: 8d3e455271ad7c1bbb340708cc2d960cc82adc31 SHA-256: eb389aefcf2e409328ce804ed74a5b7cc7b32bcf5edf8fb9b3f131e195396344
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests a phishing or redirection attempt. The PDF structure itself is also noted for duplicate object bodies, which can be used to obfuscate malicious content. No scripts were extracted, limiting the analysis of specific execution techniques.

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://feedproxy.google.com/~r/razvivatel/yapz/~3/-MXWpcYQ7kA/square?utm_term=energy+band+gap+of+pn+junction+diode
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec79a1288cf71862a8867b/1626110369567/developing_tactics_for_listening.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee6ce65f7927514e4019e0/1626238182890/87898625918.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_off0000df90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 16792 bytes
font_01_sfnt_off0000f7a7.bin
0a80ebbc711be9e87ae054162d67f43c761103b39b5e487e1bcb099f2a8edfbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 11048 bytes
font_02_sfnt_off00011110.bin
1c63fbcf9a28b306dae614693ab3f78b3c01afef1df2d22854d527ed20749b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 18352 bytes

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