Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfe5a25cf1f044d…

MALICIOUS

PDF

74.0 KB Created: 2021-01-30 05:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 18736ea5608bc0c31cb2bb4240c753df SHA-1: 9f2cf70007ce6de6b996a12fce18f9748cb3bd60 SHA-256: 8dfe5a25cf1f044db97f76c367531ba800a0bbe530ea1a79eca0d67bcdfa26e6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one pointing to a suspicious domain 'druttle.ru'. Heuristics indicate the PDF is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

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/123?utm_term=waterproof+watches+for+women PDF link annotation
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/jidagaruroma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_600ff69155d51.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/JydKhcl/81753273614.pdfIn PDF document text
    • http://milky-rp.space/1652289307f8r35.pdfIn PDF document text
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/jidunemofufedevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5ff1d2787b83e.pdfIn PDF document text
    • https://cdn.sqhk.co/gesimefav/hcjfgeg/65048007931.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/gilabosuge-meforo-tutivoxi-toxikununu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5ff4b421b9761.pdfIn PDF document text
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/mofufelofitasenaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483836/normal_5fd767f1e1516.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/biwuwukesazef/76173816863.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/dumaxamigifumis.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/wezibaxunorevopagemu.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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 5328 bytes
SHA-256: 0f4e01ece3f26a2794a665f0b3d35d779660fa5bbcbbe68fa98550709081ad78
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 11112 bytes
SHA-256: 9c4b91a2ccd9496368a6bc8e4ec3302613f1ee8b6520147c36fae83ee5b6e7b5

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