Malicious PDF — malware analysis report

Static analysis result for SHA-256 af924a94b3455655…

MALICIOUS

PDF

71.6 KB Created: 2021-05-28 09:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81b851b07ef8e3deb7bf51131366c328 SHA-1: 70e4dfa59629c314ad232c3b706b8a4200a92f98 SHA-256: af924a94b3455655e01d27fc03650099c2f9056f7bfa2cab3be372ac2ea47456
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 0.9991

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://baarspo.ru/strik?utm_term=how+to+use+a+hoover+spinscrub+50 PDF link annotation
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/xinoxomo.pdfIn PDF document text
    • https://siraxaroxaran.weebly.com/uploads/1/3/1/4/131483069/3292043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fc5703480100.pdfIn PDF document text
    • https://jubaxotuxemis.weebly.com/uploads/1/3/5/3/135301284/1fc0f30d4817d0.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/relusurebaruvep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_604926ae20dd9.pdfIn PDF document text
    • https://rukixuxasob.weebly.com/uploads/1/3/4/7/134703890/9e7249c513f.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/b3ba81ef-24ef-47dd-9017-a606876f3f6e/gabriels_inferno_part_2_passionflix_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa31ef30-735f-415f-9749-2b8e1b343c18/common_core_standards_math_5th_grade_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67883442-2d38-404b-a93a-5d2fb968545a/craftsman_18_inch_chainsaw_chain_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b052d6e-3c47-47b9-ad50-66d80e511ffd/what_is_study_plan_for_master_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210c2508-3027-4d93-84fb-f3e50acd62ac/76658527177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada2dc6c-6b5f-4ed3-8a7c-a8da4812b4bf/how_to_draw_girl_poses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3269e62c-b165-4398-937b-088cb1d96a07/mulotivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c85791-e882-4d4c-8cbc-cede56afb4dc/the_shack_full_movie_download_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9051f111-0254-43d9-a5bc-f35bf0fe03ad/mamozufod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a424eb9-f93f-4b45-b4a3-35098b4bf6cb/gelol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2551ef-4c39-4af7-9907-cb7fd0499e83/how_to_program_clicker_model_klik2u-p2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743b65a1-fee6-41d9-b713-eca82d5529f5/preppy_handbook_schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6cc488-578c-45d9-8c67-e943392919b0/30_days_-_change_your_habits_change_your_life_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcae19b6-1a8a-4897-b0d1-c58244af557a/97141656600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de60992d-3aa0-4ddc-999f-2464d946ee34/asus_xonar_d2_drivers_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973a8856-dc20-4008-ab93-f49f17942163/45049164983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f49c895-86aa-4366-b423-3416876a13e4/besejerifijovusu.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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 5508 bytes
SHA-256: 3f287a2d70ccc9987a7871b4efff296591e73ce24a7f6eee50be6038e4ac5177
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10408 bytes
SHA-256: 5e1d1b98f1e8376f2652f5fc0afabe89e8ba67d9b76bf44540cebf9fc3a7733b