Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5eec63aff3aa97…

MALICIOUS

PDF

72.0 KB Created: 2021-05-05 18:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 58649d922a5935421d7c64823dd336a9 SHA-1: 5c1b4654b1dfa0af5a170c6677df07d3c179bc4a SHA-256: eb5eec63aff3aa9758ded798b3ff538a4c07fb9d3eb0f05c25eb35ad40f81dc2
66 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 one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the sheer volume of external links suggests an intent to redirect users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://kuzutuzo.ru/strik?utm_term=grade+5+descriptive+writing+samples PDF link annotation
    • http://buvofigutunam.22web.org/68203989363.pdfIn PDF document text
    • https://cdn.sqhk.co/jalinutaxos/cggi0jf/xizisonuvakonojuvoxelon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403130/normal_5fca229c26ec1.pdfIn PDF document text
    • https://cdn.sqhk.co/rexadiwixox/hckjaic/consumer_reports_canada_best_mattresses.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuwizatag/hjmjagh/monopoly_bingo_app_cheats_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_6067a905788e9.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwedizisor/cjijhby/ielts_writing_answer_sheet_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_605c74b759d48.pdfIn PDF document text
    • https://cdn.sqhk.co/nisavivurefu/YHtjfjc/66946511603.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/25079006565.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/evermore_alyson_noel_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/ibajihb/pasukomoxilopijabar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_605682c6d6a50.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/academic_writers_online_jobs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465538/normal_60001a0c19e91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fcab2ac67cb0.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/79286369712.pdfIn PDF document text
    • https://cdn.sqhk.co/bozomixega/jijijzn/microsoft_3d_maze_screensaver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gewasitumeve.epizy.com/pinobilazoredirox.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_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 5700 bytes
SHA-256: 92cdc940338e777e22d9e2381d4c0a6dc93507414b361b5c3296794cbcb945e4
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 10156 bytes
SHA-256: 3513acb530568836362d66cab38169fde92051f2484918450e9fbe55b6920336

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