Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f5c3953695c7b8…

MALICIOUS

PDF

82.7 KB Created: 2021-04-07 21:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8373b0c03b5b6397a49a17d38efd0246 SHA-1: 5a89aaaa3edf42e7d3bedda429568e2590c34be3 SHA-256: 90f5c3953695c7b8e086b1c942e0311cb3be65b56ea6e3dc8343b690466f7331
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=bleacher+report+nba+trade+deadline+predictions PDF link annotation
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/xemimot.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/Mgegjgh/spelling_bee_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kezinujus/gWIigge/nfl_fantasy_football_rankings_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_6055c1b840ca2.pdfIn PDF document text
    • https://ruwefenoref.weebly.com/uploads/1/3/0/7/130739117/kijajuxol.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/7uagdMM/mystic_messenger_707_route_chat_times.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/hfkdYgf/nasufozawido.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/7807949.pdfIn PDF document text
    • https://cdn.sqhk.co/boxoveru/tjcVYW8/48624700057.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/9550095.pdfIn PDF document text
    • https://fobujetomifaj.weebly.com/uploads/1/3/4/7/134765034/30842a7a418f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_606abf4d747c5.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/vozekevan-vazebaloxav-dogujexazedeme-dozumojopalev.pdfIn PDF document text
    • https://foxikojowi.weebly.com/uploads/1/3/1/3/131398405/fawekesod_pomuwufufis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_6003bcd04ba28.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/e35e9c78-b79b-47aa-bba7-072646f4a3d7/andromeda_strain_book_vs_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c86e30-2f15-4d00-97b0-630d9181ce47/46175814711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/104de793-ad74-4d7a-8f1e-69bd274a54a1/did_finch_die_in_all_the_bright_places_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2dce51-6fe5-4755-a410-2a032ae2b1ef/dajiteparoduwise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0228cb02-496c-4e8d-ac90-4fe4f174ba37/xukewajonuxoxex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af496f87-cb63-4397-880c-d1dee0c76f5b/nomalexipetudometebam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d03bdc-8099-4a38-84c4-aaaba2af5e6b/replacement_parts_for_master_forge_grill.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_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 5348 bytes
SHA-256: 28af9d2120e19d8eaaac820575e740653d113553b00b05ff1eefe235a94f1f42
font_01_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 10892 bytes
SHA-256: fbdcf707a654407eae105c054a370682c8ed3427782ca9a7d00a3efc30db898b