Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfb47caccf21516…

MALICIOUS

PDF

79.3 KB Created: 2021-06-03 15:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 03718bbbaaf4b4e1741d7e3dee63e130 SHA-1: e0299bc14229fdbc036b624d48f21a60c798f253 SHA-256: bdfb47caccf21516a71d4e5da676d255698a2f5969de1f16fa5108185334547d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection attempt. The primary URL, 'https://krisoc.ru/pbw?utm_term=how+to+do+mla+style+in+text+citations', is likely the destination for the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=how+to+do+mla+style+in+text+citations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380073/normal_600b4fc315760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_5fd9727b85e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_602b07a82ea3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_603e73d0e2599.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/30fcbf85-5c7e-4972-844c-0df889d5c2f8/dragon_ball_z_shin_budokai_2_mod_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5213f073-91d8-4d99-a3a9-24b5a6322f58/75208011323.pdfIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144539646/75695777871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b1e829-3a88-4818-933d-ba12db3b8b59/28831775768.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/f/vugewerafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3727b8-a9dd-4618-a0d2-9f0053454636/how_to_attract_money_joseph_murphy_youtube.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144425208/70320694802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c1b70a-cacb-40ea-9b7e-edd1726e0886/killer_instinct_snes_moves_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8d7e2a-9ebd-4f1d-af08-90af66dd4653/58135458132.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144425538/how_to_reset_a_frigidaire_front_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17da4f7f-cf64-4397-95ad-fa4a5c6e8b7c/wubevutaselunezukezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9022ca-b4e2-4eb4-9be3-e2216fb5aa13/what_is_the_symbolism_of_the_raven.pdfIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/144460620/windows_10_internet_explorer_bookmarks_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cbc342-0f0d-4246-9331-0b5861c72001/bujip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8748dc-6511-4efc-864d-22ba65f99712/how_do_i_reset_my_parrot_mki9200_without_remote.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/vunalijojanojibo.pdfIn PDF document text
    • http://lomubel.pbworks.com/w/file/fetch/144495591/fidogaxiridujuxoditodunoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6069dd44-03d2-4a51-844e-2ebc1c3dcd8e/bobazul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ee54e0-80a2-48af-a5d7-d2b38eade8aa/code_of_points_gymnastics_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9313ea-b2bc-4bb0-8226-dbc414b1fc50/15941974594.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/farmhouse_coffee_table_plans_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a82c30-62de-45cd-b756-db2937f8ca5c/intex_2500_pool_pump_timer_instructions.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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 5212 bytes
SHA-256: 2e006687bcd107c5419e25f6ba487f755ef36b0f7e4a6350e60b2cab12880b8a
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 11136 bytes
SHA-256: b49ee4ddfdb53a11ca8f09cd0026d80ef4bed3efbf700816f9f1d491f7c5f765