Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94874ed222ecfb6…

MALICIOUS

PDF

94.4 KB Created: 2021-04-15 02:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dabee5441688ab9620eb87b7fd483138 SHA-1: 25a74023456b017e80363bb7823fe215da4da2ad SHA-256: b94874ed222ecfb63506e327951773b0e8c00aae80ccc3a3b48010bc01dbd443
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent to distribute phishing content. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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/strik?utm_term=the+prince+of+persia+movie PDF link annotation
    • https://cdn.sqhk.co/nufopusifa/jbTNgcM/idle_island_city_builder_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/ezigjjb/transparent_live_wallpaper_apk.pdfIn PDF document text
    • http://brosbass.com/4371476308isr3b.pdfIn PDF document text
    • http://prizinsta365.site/997441919294rvft.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/jfibDhh/sago_mini_world_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/ggjiHji/33269583004.pdfIn PDF document text
    • http://stat-index-co.com/d_link_dir_615_hardware_version_t1_firmware_upgradecb3ni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_4c4faa37c7df485db42622359b50af4e.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_78cc622d416a48a380074b8878b22a8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3f1bf5-2823-436d-9fb2-c04e72c37a56/21952114883.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_8e73db6384ee49cebe9a4ec57a021bb7.pdf?index=trueIn PDF document text
    • http://kegepedefaripi.epizy.com/how_to_install_ezdrummer_2_expansion_packs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2a82f7-f6da-422c-ade2-ef463436fd9f/xesiziwawonamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e3d28f-7822-49e8-8f2a-c83b5fdc5956/48155029822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0879746f-2492-48dd-b623-a9651e113247/yashica_mat_124_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f042fa57-d15c-44d1-b116-958f96b5da11/how_to_turn_on_a_evod_pen.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_e1dbe0baab5d4416a9d8b9327659a461.pdf?index=trueIn PDF document text
    • http://solovusuzuvise.epizy.com/59472602236.pdfIn PDF document text
    • http://jajunegetilu.rf.gd/56763713057.pdfIn PDF document text
    • http://karifopiti.epizy.com/monogunel.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_fe836b23107442ad82c6c049344b6538.pdf?index=trueIn PDF document text
    • http://tituroxir.rf.gd/44684313354.pdfIn PDF document text
    • http://tivogowajap.epizy.com/bubara.pdfIn PDF document text
    • http://jipumenovimol.rf.gd/applying_for_a_job_email_format.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_off00013040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 5232 bytes
SHA-256: 2d4270784a23783553a8418ba51d0945787e1301ed944769e2393b8287f3b7ad
font_01_sfnt_off000141e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E9 12588 bytes
SHA-256: 47112ca40dbf75865675d68c352f172b33a133b6ebac108430ee20673081a2b8