Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b0b794dbab8f58…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 09:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 93b6ce252e577c97d49b46a0f04dea61 SHA-1: 2dc794069340e26aa81fd65a5259c6e0ce6cbe11 SHA-256: 91b0b794dbab8f5833277613225afa6180e36338ae64440d09b0e02a47f8fa9d
126 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=what+is+another+word+for+not+progressive PDF link annotation
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/511748.pdfIn PDF document text
    • http://lavorunolutoga.22web.org/cheraw_dance_information_in_kannada.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/97f7c3b964c.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/4775772.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/R0qihe6/republique_video_game_review.pdfIn PDF document text
    • http://golepikoxeware.22web.org/48384659932.pdfIn PDF document text
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/lozitefi.pdfIn PDF document text
    • https://zetakopazo.weebly.com/uploads/1/3/5/3/135351561/wumijemumepi-jofet-tigizofebevu.pdfIn PDF document text
    • http://teenagetutor.online/57099986875xkb4v.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/dgdFigN/52127052422.pdfIn PDF document text
    • http://sevastopol.sale/fututeludamubck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/watajive/21193288446.pdfIn PDF document text
    • http://nijozemujag.epizy.com/45338788814.pdfIn PDF document text
    • http://jasigobup.epizy.com/buzor.pdfIn PDF document text
    • http://sitasuwa.epizy.com/givujabitopazuf.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/halo_bassinest_swivel_sleeper_bassinet_-_essentia_series_white_blue_ikat.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 5436 bytes
SHA-256: 1426f6065bf673fc6ec0a4c1eb7bc6a148682c9de275c1139481f03be8fa869d
font_01_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 11572 bytes
SHA-256: 3ab8028b5c54c8c1569331e351312dfda0262ff9f6fe735e644f29210c90f32e

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