Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fb4e6115f91a5f…

MALICIOUS

PDF

83.4 KB Created: 2021-04-03 19:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a07c089cf3c4d72526dd585d0e81e0a1 SHA-1: de7fa82e4df5a28da4316345f2cfd16010028952 SHA-256: e2fb4e6115f91a5f116da3dd991730d6abd94e5546ed4906d47be05e4eca4331
66 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is flagged as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the PDF structure suggest an attempt to redirect the user to a malicious site, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/wix?keyword=vocabulary+clipart+capitulo+3a PDF link annotation
    • http://lerinumemikiw.22web.org/ben_10_cartoon_network_android_games.pdfIn PDF document text
    • http://dudisukogonox.iblogger.org/82904428193.pdfIn PDF document text
    • http://bozenuvobe.iblogger.org/is_one_punch_man_the_best_anime_ever.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/xijalovelokolep/basics_of_software_architecture__design_patterns_in_java.pdfIn PDF document text
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_8beb4ac095ed403f927d13b0109862f5.pdf?index=trueIn PDF document text
    • http://pabizazixivak.epizy.com/mahiya_mahiya_adnan_sami_song_free.pdfIn PDF document text
    • http://mafonoxerinomif.epizy.com/tavatuw.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/peguj.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_41b306a7f0184405a7ed6807b540263a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desenaz/4714065683.pdfIn PDF document text
    • http://bobamexexaru.rf.gd/5890026691.pdfIn PDF document text
    • http://favepos.rf.gd/state_employees_credit_union_routing_number.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/jijosuduvesuzu.pdfIn PDF document text
    • http://jutademopewe.epizy.com/how_to_start_ryobi_2000_psi_pressure_washer_manual.pdfIn PDF document text
    • http://bodagoge.epizy.com/words_to_describe_trees_in_a_storm.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_f5149b6c6c27450387b4b1284c8c69bb.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_05de72493fe047d3b401d551ed413fca.pdf?index=trueIn PDF document text
    • http://xalanijowule.rf.gd/kofemuw.pdfIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_2a5ac432397e47cf810e049241653fdf.pdf?index=trueIn PDF document text
    • http://nuxawavevatisof.rf.gd/carolus_linnaeus_classification_system.pdfIn PDF document text
    • http://vifixokosakagos.rf.gd/gepolono.pdfIn PDF document text
    • http://bamefifib.epizy.com/hanauma_bay_guided_snorkel.pdfIn PDF document text
    • http://xaduneraxoden.rf.gd/molevajewefatezepemovufuk.pdfIn PDF document text
    • http://gutuxujerulobed.epizy.com/frozen_para_colorear_descargar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 5120 bytes
SHA-256: 475b8aa650a3ca92b467322c05690fbe0178b86fddcaedfb7d6eae2ef9ad64bc
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11772 bytes
SHA-256: a3dade377f0deff832ce3cac4a612bf0a19d64ad2e4b84bfa229db1cbe413143
font_02_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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