Malicious PDF — malware analysis report

Static analysis result for SHA-256 5708fba42bd8925e…

MALICIOUS

PDF

79.1 KB Created: 2021-02-15 22:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56ac4b56482a1f03b7ad1e8e86d3a01f SHA-1: 73854ce73d2b03a462a6f5da0a29e071e89cf4a8 SHA-256: 5708fba42bd8925eb546e5f1e44e188f79ee83b7b14214b64b82fc0f75ffb17a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=ub40+can+t+help+falling+in+love+lyrics
    • http://weinmvc.net/libros_de_leopoldo_zea0l0ss.pdf
    • https://cdn-cms.f-static.net/uploads/4483855/normal_6011391ae1d8e.pdf
    • http://help-feedback-amzn8.xyz/challenging_cognitive_distortions_worksheetsypv41.pdf
    • http://mail-autoscout24.net/best_scan_apps90spa.pdf
    • https://cdn-cms.f-static.net/uploads/4409630/normal_6019f5bf54797.pdf
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5fe8e9c04d4d5.pdf
    • https://cdn-cms.f-static.net/uploads/4393204/normal_60199f4ce0b63.pdf
    • http://bafekovarobuju.iblogger.org/41915058547.pdf
    • http://premial.su/oof_piano_free_onlinedvot4.pdf
    • http://bumaga.bz/premiere_pro_templates_packa0qfg.pdf
    • http://7gusevshop.space/dan_the_man_josie_fanart4v3kh.pdf
    • http://update-win20.online/vepafapipufukete1n4eq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bolunivagoxel.epizy.com/dudiw.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74d.bin
340b0b4284280a52ce9c8fe6f8a94645e96c792e5c6f95e784e25d27993629a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 5800 bytes
font_01_sfnt_off00010b15.bin
d1ee950b43ee71b3b5816dbafb342b1a0959a01693756ce7163fa625d76a5e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 10952 bytes

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