Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfce9c6bfb0bd924…

MALICIOUS

PDF

84.8 KB Created: 2021-03-29 14:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 86906beeba702879e596a0e43f4f2159 SHA-1: fa008b6486ab8574f8f83fa405c4a33340b67f2a SHA-256: bfce9c6bfb0bd9247b91c22f80d93dcc750296f86231addb98d61631aee6f8ec
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external links, including one to 'vilenefex.ru', suggests a potential for downloading further payloads or redirecting to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=hp+officejet+4630+ink+cartridges+walmart PDF link annotation
    • http://muzoc.xyz/nurupodasorozabogez5kqv.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/bernard_williams_moral_luck.pdfIn PDF document text
    • http://olipaka.xyz/48217304048mgpwt.pdfIn PDF document text
    • http://kraftmann.su/apsara_aali_marathi_song_mr_jattd02kg.pdfIn PDF document text
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/508126.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/spooky_scary_skeletons_piano_sheet_music.pdfIn PDF document text
    • https://dovasivenumi.weebly.com/uploads/1/3/5/9/135965427/davuzibivowitag-pimipes-mixisekajusiw-gabenuzerotev.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/steps_of_accounting_cycle.pdfIn PDF document text
    • https://nuzopilubejam.weebly.com/uploads/1/3/4/4/134459065/f2b1b.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/frozen_jr_script_part_2_-_gibson_county_youth_theatre.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/4608540.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/zizovuwilagux-jufikanuki.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/1c75095d-f649-4aae-b3fe-c5a8287fac3e/stihl_cordless_string_trimmer_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381ac281-99a0-45d5-a458-21b664ef140c/jbl_flip_3_stealth_edition_low_frequency_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c916be-b9e3-4acd-ad5f-57e99da37562/what_vampire_diaries_boyfriend_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4191e625-58c5-40c9-a52a-1f3d240dfdb3/tropical_rainforest_biome_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545ba312-70a1-4e72-85c6-4ebfe5c7d606/17_indisputable_laws_of_teamwork_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64190cc-77a4-4220-b46e-5b9e7ad87cff/tantra_massage_course_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68c21ad-2fd3-4cf0-94cd-ddbb920e577a/how_to_reset_a_pilot_light_on_a_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b48b47-22c7-4227-a28b-c059175f1e9a/american_gods_neil_gaiman_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f216acc-19ad-4c1a-a64b-4e1c7239b520/why_did_my_washer_just_stopped_working.pdfIn PDF document text
    • http://goxafebo.myartsonline.com/49102999574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a2ec8f-9dbc-4d54-873a-1f2f19e8ae78/garmin_montana_650t_for_sale.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_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 6216 bytes
SHA-256: 683fc1c9c30655c9b4a7182fdcbb1e9ea7fb1da73fe437ef32a4c5913ebc97c3
font_01_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 11300 bytes
SHA-256: 8b648356203e7b743be76fe4ec7c5eb017b90ff38ed5d467a4ee2d8296d585a4