Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbe941b55af335c…

MALICIOUS

PDF

75.7 KB Created: 2021-03-15 19:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6d8f549257dcd45416fea7de6117dd39 SHA-1: 7aba7b3ed6a35e4fb93b6d30ad6b86253557855b SHA-256: ecbe941b55af335cd889c41621a526c96f5dd4c15224aeb82b768a2976cc9141
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=books+in+english+pdf+intermediate PDF link annotation
    • http://xirixakexove.iblogger.org/castlevania_lords_of_shadow_2_trainer.pdfIn PDF document text
    • http://discount50it.pro/5936482821684oy9.pdfIn PDF document text
    • http://dnepr24.info/uc_browser_video_pc6r2xz.pdfIn PDF document text
    • http://healthit.space/oc_character_sheet_commissione5x83.pdfIn PDF document text
    • http://lisipezasuk.iblogger.org/juponumimuxogose.pdfIn PDF document text
    • http://bestplacefor.rest/398218912446bgvp.pdfIn PDF document text
    • http://slimitalia.space/68730773852yljo1.pdfIn PDF document text
    • http://kittyplay.online/necromancy_wizard_guide_5evwaqi.pdfIn PDF document text
    • http://xonibiz.22web.org/instagram_highlights_icon.pdfIn PDF document text
    • http://sreda.city/devotional_books_for_married_couplesfenlv.pdfIn PDF document text
    • http://shop-profildoors.ru/norton_introduction_to_literature_12th_edition_mla_citationht7gv.pdfIn PDF document text
    • http://tarosuzaloku.22web.org/one_thing_remains_bpm_jesus_culture.pdfIn PDF document text
    • http://brosbass.com/42509622420yiax3.pdfIn PDF document text
    • http://cetop.xyz/7068558749642jss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7647fc6-ecc2-415f-a36c-638d34afd181/13470497627.pdfIn PDF document text
    • http://lofoxos.epizy.com/30479916344.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/tenancy_agreement_template_uk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c23b68-7391-4d70-85fa-a9ef4e9d955b/weguguwoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1d508c-791c-4919-b1e6-d4a899a1e475/26469269471.pdfIn PDF document text
    • http://xasives.rf.gd/mailing_list_template_word.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 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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 5568 bytes
SHA-256: 46c362da8868851c7ff62eba8351169e61fe573b3af459b18b59a670bacdcaec
font_01_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 10480 bytes
SHA-256: 25bfc3ae66139c22d4f70a18fecc91a1a592e5aa809db1308888e58c0fb34734

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