Malicious PDF — malware analysis report

Static analysis result for SHA-256 c866cdec33a22c91…

MALICIOUS

PDF

83.0 KB Created: 2021-03-24 20:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 512f1bdf1c562c575e4fc26def280d62 SHA-1: 693fd2b2fa23621afc0b8af0d61b01cfbedfc3ce SHA-256: c866cdec33a22c91cf2c84f0c55c5eb237186f159a164b96a41eb2be228a717f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary one pointing to 'vilenefex.ru', suggesting a lure for users interested in a 'wpt poker cruise 2021'. The document body is heavily obfuscated, but the presence of external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=wpt+poker+cruise+2021 PDF link annotation
    • https://cdn.sqhk.co/tasiteregixo/jg99611/bazitomuxerebapijula.pdfIn PDF document text
    • http://meetsoda.club/78712816450o4xjo.pdfIn PDF document text
    • http://volalagokiva.sportsontheweb.net/85382239060.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/rirido.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/hbhhthh/2033505927.pdfIn PDF document text
    • http://circus.market/wemosuneliwojozosuvunemagb1btp.pdfIn PDF document text
    • http://poroda.site/3429912732glmuq.pdfIn PDF document text
    • http://1s.london/bizefa5o9uu.pdfIn PDF document text
    • http://woxafironegeja.iblogger.org/56492034482.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/6nhdWOo/2480117860.pdfIn PDF document text
    • http://verupedobonunaj.22web.org/89618626744.pdfIn PDF document text
    • http://reduslim-ordina.site/zynn_download_link4bhs8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c53aa4-73ef-4e9c-b26c-a464e94a743f/romulanobexeromujulimibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c136d8-2025-4e7c-b8c4-5de0339e07d3/how_do_i_connect_my_subwoofer_to_my_rca_sound_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1518fae1-ea7a-49b9-93d8-23baa642e02d/mofexono.pdfIn PDF document text
    • http://fafalibowadavuz.rf.gd/how_to_flip_tires_exercise.pdfIn PDF document text
    • http://zofududa.rf.gd/dumesuwemuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f728164-aeb0-4548-ae81-5823bfe78d3d/namikelawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1050d4a-f6c8-4a55-858a-99eada6c2753/57413576117.pdfIn PDF document text
    • http://gototura.myartsonline.com/samuel_beckett_bridge_at_night.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/south_africa_political_history.pdfIn PDF document text
    • http://zululofigitesep.epizy.com/1163946101.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/golemans_six_leadership_styles_self_assessment_questionnaire.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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 5088 bytes
SHA-256: dab439adac17cb7a903a1f4018c0a025e64b0ca5318a7efb1ba89d67b690d4cb
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 11520 bytes
SHA-256: 8be790d37f61b4353c4cd73f3db3638ff1cffa609d734e5da6e954739b1bf8c6
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848