Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4f518aa392ea1c…

MALICIOUS

PDF

67.6 KB Created: 2021-02-28 13:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 43b35a4cc356aa59b1cd1ff75e94c17f SHA-1: b6912f8ea5d3d0d4b7521727c615c31e20896e9e SHA-256: 3b4f518aa392ea1c299114e16422b5f5627a2cde15bf537a0febc44d5edec7a7
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, directing users to external sites. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to reference a quiz, suggesting a lure to trick users into visiting the malicious URL for potentially harmful content or further exploitation.

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://pelibifir.ru/wix?keyword=chapter+6+mid+chapter+quiz+geometry+answers PDF link annotation
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/dimaza-kusegisutozeb-rurewilufub-mogukukepomigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491173/normal_5fe163954bbde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369771/normal_5ff51b3da6cb4.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/cms_publication_100-02_medicare_benefit_policy_manual_chapter_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_6013a3f018ab5.pdfIn PDF document text
    • https://gozaperirij.weebly.com/uploads/1/3/1/1/131163841/pilorosa_fipugok.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/spanish_inversion_words_quizlet.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/itll_be_alright_meaning.pdfIn PDF document text
    • http://talkme-news.info/toshiba_regza_42_inch_reviewujfen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/9309286588.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/bluetooth_software_for_laptop.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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 5884 bytes
SHA-256: fb2adbb3190766ecc051a2621f3456b5b24ebb291f6d9ce1536aeb7f55099eac
font_01_sfnt_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 10328 bytes
SHA-256: 8ac30f13bf8acd45b34f03adac26dd486ba1997fd95ecb74dc86277efce4c179

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