Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61926136c3fb56f…

MALICIOUS

PDF

75.2 KB Created: 2021-03-27 21:33:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bff8dcea09bb52bc1cbef5c20475f209 SHA-1: 7f345a4a9e0d00c0899ff337ddd78ecfda3ce61e SHA-256: c61926136c3fb56f02d06df05b887f29baf67372f16f904d2126a91509763f01
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, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The primary URL, https://jacksth.ru/strik, is likely intended to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=what+are+some+of+the+easiest+dogs+to+train PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367312/normal_5fe3fa8a51a89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fdf0ef2743c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_604e0d8a0e094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_6000c3af08cc5.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/ildiec6/64681769260.pdfIn PDF document text
    • https://cdn.sqhk.co/fibapezo/djiijcj/88814486014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_6023cfc592e8f.pdfIn PDF document text
    • http://muwawukiseka.iblogger.org/employment_news_paper_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452374/normal_600e226e8d87a.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/Hic5Uhj/84482173092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_602cf510d12c4.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/ijaSgfO/41080363189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fdb0cb77f871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_60223ebb9ad4d.pdfIn PDF document text
    • http://suposisubi.22web.org/fusedodir.pdfIn PDF document text
    • http://kuzikugipitimiz.iblogger.org/acymailing_documentation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366331/normal_5fcf70a948c0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulawev.epizy.com/clash_of_clans_without_play_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d87359-bc94-4c78-88ba-0d0ae08a15ef/71920777142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939b73a6-05c1-466a-a09a-3168e033c658/susopatiwipag.pdfIn PDF document text
    • http://meferujapepaz.epizy.com/how_much_does_google_books_cost.pdfIn PDF document text
    • http://sidiwen.epizy.com/jexok.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 5304 bytes
SHA-256: 8b21d8c7bf9c8473b471137ccb78513af0c544cbc1d142e0cc7750e8009e952d
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10532 bytes
SHA-256: f99e2fe5047b43ae393e82eb548f3172630e4b0bd8abba616d94f53ea9fb89c0

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