Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3340f511666700…

MALICIOUS

PDF

71.9 KB Created: 2021-05-07 18:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a0ea74c01ef2f27b50304c4ea403143c SHA-1: e354eeab82465aa4446e16ec83810ec28921e37c SHA-256: 8d3340f51166670060acdd0d61e70dd43d35f3ba75f4a881662d8bb2dec9c8b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate this is a deliberate attempt to create a network of links. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=nicomachean+ethics+book+8+pdf PDF link annotation
    • http://mujudesuxiropa.sportsontheweb.net/fowemalepegal.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/83505315430.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/wofisapipifupikoguxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_605fdba77278a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_601212060d616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_6067c7df3bbf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_5ff2fec8d7f15.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/agenda_2020_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_24266f2f291e4899aab1f3d2bcf652c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3784da9-9ef2-4cd4-9568-11fbf3093058/1981_honda_express_sr_carburetor.pdfIn PDF document text
    • http://kujafugakare.epizy.com/fefekorel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c12a3a-eba7-4ce7-90df-aefa3ff81a74/98176237517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3d6dd9-81bf-4d3d-b92e-b54a2b6fb098/top_notch_fundamentals_workbook_unit_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad650fef-28d8-4386-8a5e-7068bfdb873d/cuanto_equivale_300_gramos_de_azucar_en_tazas.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/wuluzo.pdfIn PDF document text
    • http://ziwuxokivob.rf.gd/41074471127.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_6a1abb4bcfd044448d395ca9a681d178.pdf?index=trueIn 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 8

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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 5632 bytes
SHA-256: baebaec2cc41f51fb1dbddb12500ac79e0d8e5d673793f19bd4274cc6f70cb96
font_01_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 10152 bytes
SHA-256: 81a2574cd02be69687ffbfd510e2ac3302e16e9c15ac1d85bc768bdfa6e7b92e

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