Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c6c4842543183d…

MALICIOUS

PDF

70.7 KB Created: 2021-02-28 16:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d6a99530595676ae44ec89343f98ef51 SHA-1: 380c8eea0235c00fa25567669af10fa60b3ebcc3 SHA-256: d5c6c4842543183d59e041d6774c3c6d276a230732a1726429b5ce476fba328f
124 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and creation dates, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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
  • 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
  • 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://ponafet.ru/award?keyword=should+i+clean+my+outside+ac+unit PDF link annotation
    • https://nafepamozox.weebly.com/uploads/1/3/1/0/131070284/8ff18df6366.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/9c909c.pdfIn PDF document text
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/memizoxajufitelatef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fe4ef27bf223.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ibHgjhg/muvubobowudo.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/7520468.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/how_to_get_bookshelves_fast_in_minecraft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487665/normal_5fcc5698bb136.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/ciczVAx/lighthouse_inn_crescent_city_ca_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/cO0icTg/xonazuwuwozopilif.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/dNKoFhh/empire_type_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jPEUbhf/mumeralep.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/woginitefodotof.pdfIn PDF document text
    • https://cdn.sqhk.co/kidirugolo/hbDxHXq/29957335900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601fab312ab43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/amc_8_2020_scores.pdfIn PDF document text
    • http://kopolug.myartsonline.com/law_of_equity_and_trust_notes.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 5288 bytes
SHA-256: ccd235190e0e2e85e0daab065b5afe6bc68b2ad7938a2acdc8333e4e446eada1

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