Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7826f44819dff8…

MALICIOUS

PDF

77.7 KB Created: 2021-02-28 06:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 44f92ab6c46646204c5e0817be507691 SHA-1: 0f63f5c5cc60117127d305568e64023e7bdc9854 SHA-256: 3e7826f44819dff88c99cb4852924e83a251d8188b29eacafe66b411e69226f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are presented as search results for various topics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=historia+do+brasil+resumo+5+ano PDF link annotation
    • http://vanimerukaguto.scienceontheweb.net/richmond_water_heater_customer_service_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_602c6e2679aa0.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/data_structures_and_algorithms_in_c_2nd_edition_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5fd77a34f3af5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452398/normal_5fc813b9339b1.pdfIn PDF document text
    • http://wezinesiwej.iblogger.org/texas_instruments_ti-30x_iis_scientific_calculator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/7C7Kpuj/infected_ingrown_hair_cyst_home_remedy.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/Jl4rAic/monster_shooter_platinum_mod_offline.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/43248411031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5ff971a6d8351.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/zggexhZ/grail_knight_vermintide_2.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/dbb1da0ba4.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/whats_the_difference_between_kitchenaid_artisan_and_professional.pdfIn PDF document text
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/7030601.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
    • http://gozipoxux.rf.gd/mikijudozisokogu.pdfIn PDF document text
    • http://sozidaxaguzir.rf.gd/batman_unlimited_animal_instincts.pdfIn PDF document text
    • http://zukavinu.rf.gd/46559550492.pdfIn PDF document text
    • http://fodakobenolam.rf.gd/what_is_the_pali_canon_in_buddhism.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 5076 bytes
SHA-256: d33874d031508855d605f72ff02e8a548f291ac69c57b1d1b0296f3489356569
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 11428 bytes
SHA-256: d70e671b3dc75aa0184fe3d7f7f0b9e9b5d9333d50bf812554e68ea73567ca97
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3