Malicious PDF — malware analysis report

Static analysis result for SHA-256 25feec38880f3180…

MALICIOUS

PDF

81.2 KB Created: 2021-05-16 10:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 961f7b5e5a4691d9a5a4687aa675ebb2 SHA-1: d8cab730a35aa16f58e11f69c16653f8ee560529 SHA-256: 25feec38880f3180199d2b8e67efb1c8eac6da0b7064df7dacceb30a6cd24f6b
126 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=how+can+you+prevent+vertigo+attacks PDF link annotation
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/f683c56d.pdfIn PDF document text
    • https://cdn.sqhk.co/dotifonuvuwi/jekjhDn/five_below_locations_in_florida.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/9767380314.pdfIn PDF document text
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/0dad78898.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/djcjijf/73848426979.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/spanish_dictionary_book_online.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/pathfinder_pawns_bestiary_box_3.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/dkicgiZ/red_ball_2019_guam.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/98980058694.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/cjhiemR/33355263598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_0aa2b9d4bb0843cc8150831941ada9a3.pdf?index=trueIn PDF document text
    • http://womawujun.atwebpages.com/36086632088.pdfIn PDF document text
    • http://lusozeto.epizy.com/mazepale.pdfIn PDF document text
    • http://limepupotof.epizy.com/mekapexagixaraxin.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_1e1bd2ec7cd943698d7d34570970cd04.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_c2d3bb8acca042b5a754ef90ccfc02a3.pdf?index=trueIn PDF document text
    • http://fumibilulad.atwebpages.com/lulonusajisojub.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/biggest_companies_in_the_world_2020.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/aeropostale_application.pdfIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_996f44fe0e39464a90f510a2861c86f1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 5228 bytes
SHA-256: 0f286f43cf3a3ce8cea536a79bda163ad66e5f43594d05287439e8d1322df750
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 11684 bytes
SHA-256: f4832618f0c3a0688e4244f2e9f9da93c92ad6ad545390f7f2ef2c23197f9d6c
font_02_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361