Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c66ad59708acd85…

MALICIOUS

PDF

75.3 KB Created: 2020-11-25 08:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 1b2449da9f6699709a0bbcab7e5c6a30 SHA-1: 3440cc14907e92adf1a4b63ed1c9f6150d730c30 SHA-256: 6c66ad59708acd85ef0a1e48f989dea99f4ef2d6bea3cc6da33e08c3cb29ec17
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 embedded URLs, with a high concentration of them pointing to disposable hosting and configured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=rate+constant+units+for+zero+order PDF link annotation
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/julebuzovejokofuza.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/xopin.pdfIn PDF document text
    • https://muxekedov.weebly.com/uploads/1/3/4/7/134706321/1161040.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/dukemapa.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/wirefokopewa_logud.pdfIn PDF document text
    • https://rixajijinuroje.weebly.com/uploads/1/3/4/4/134473879/badafosuvinu.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/856739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zalomi/asc_606_fasb.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/multiplayer_games_online_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/36784133270.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/jimof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2d564b-71a5-42eb-aeac-3ffa06b160b2/27556764794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f626e3f1-3dc6-4b75-991f-078cae3feecd/22852872281.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 4924 bytes
SHA-256: e387b77f01947c5861f45e59c9fbef7df12ae042769f0704a13d383f085cd109
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 10848 bytes
SHA-256: dfb4be93bb1476d5b31cba115c2a5f0fd3d5fa1204e3dc5149c35fcf7df0a4b7
font_02_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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