Malicious PDF — malware analysis report

Static analysis result for SHA-256 23846095a212d278…

MALICIOUS

PDF

69.5 KB Created: 2021-03-31 22:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a3b053beba161157a4751b6e1d3e27e0 SHA-1: 8a08856a436714b2279220dd6e01df060dde2aed SHA-256: 23846095a212d278be0f4583202b44f4cf55997b69ce79929d1e2b85041ae6d3
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The presence of embedded URLs and the structure suggest it functions as a link farm or lure, directing users to potentially harmful sites like 'vilenefex.ru'. No scripts were extracted, but the PDF's nature points towards a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=electrical+components+and+their+uses+pdf PDF link annotation
    • http://tefulen.iblogger.org/the_crucible_comprehension_questions_act_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_603f1411214a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_605b971bcbf5f.pdfIn PDF document text
    • https://fofezuse.weebly.com/uploads/1/3/0/7/130739341/2d4d14f93096.pdfIn PDF document text
    • https://rekopazexejur.weebly.com/uploads/1/3/4/6/134602417/lasubebaxagug.pdfIn PDF document text
    • http://xesifavaner.22web.org/how_to_spotify_music_onto_iphone.pdfIn PDF document text
    • http://dibubewivutuva.22web.org/14043334953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_6056df1a6067d.pdfIn PDF document text
    • http://bewudewumit.sportsontheweb.net/kakedij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601b34d8ed198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_604873a0e8ecb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/xipesi.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/kedoxobowagowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746ed2dc-cd3d-4cf5-9a80-738edc365af0/little_alchemy_cheats_how_to_make_air.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/how_to_use_suddenlink_hd_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961eaa32-0c7b-4591-b920-7073a0feb71e/hoover_windtunnel_2_high_capacity_upright_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e84ec6-a0b4-4e23-9465-f4749aefd981/95534719904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aba26b4-7ddc-45bb-a914-8262fa3b53a4/panupufuwutalizexarefo.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/g_shock_rangeman_gpr_b1000_strap.pdfIn PDF document text
    • http://sefibonep.rf.gd/how_to_use_a_cabrio_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ace19d-dad9-4776-8614-af75a2d39416/cual_es_la_importancia_de_la_psicologia.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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 5352 bytes
SHA-256: d78a940dc17b9b0f07033dc2b2329dc0223580fa68be1ea378abe6a5b5a52f6f
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 10404 bytes
SHA-256: 27826898e478dd252296bea11d90352ca7eb9ef72ac75ae7a890a52a8b67d65e

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