Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90ade5b76201cba…

MALICIOUS

PDF

88.8 KB Created: 2021-03-21 08:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 88cbeb98727eaaac8019bad63a6af16e SHA-1: 2bbd3e997e3a683efb8d287b6d0fafd39a42867d SHA-256: b90ade5b76201cba273a99d6d7b944e038b0e9f8ff0ce9f492688df169f5fb28
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=resumen+el+arte+de+amar+capitulo+2 PDF link annotation
    • http://helpverifybadges.com/journey_to_the_center_of_the_earth_3d_dvdbssrv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_601b40eacd2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_602e3620cb457.pdfIn PDF document text
    • http://inglassrus.ru/fanusimam6fy1.pdfIn PDF document text
    • http://digovin.getenjoyment.net/plantronics_voyager_legend_bluetooth_headset_parts.pdfIn PDF document text
    • http://helpverifybadges.com/google_sheets_vs_excel2wumh.pdfIn PDF document text
    • http://umniashka.ru/cloud_computing_architecture04rky.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/89576163258.pdfIn PDF document text
    • http://silkhfig.bid/xinofixagojazeboxapi6zxbv.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/demonstrative_pronouns_worksheets_with_answers.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/3d269099-bc67-4238-8f50-910a9be77135/how_to_set_xfinity_xr2_remote_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e643e481-12ca-44e7-8c10-6a83b2717f17/lojurera.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_46cdfaa2b02444948bb249d9ea4de637.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34648d97-82b5-4b61-897e-a0e8c30659c1/2007_yamaha_v_star_1100_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b596db-d844-49c5-8c27-c4ba30c81d09/36244038250.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_e96375bd3e9346a2976ae614c742798a.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_99e8959e9fc84f5fb65571056bf32c3f.pdf?index=trueIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/does_chick_fil_a_hire_at_14_in_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e778da34-64f2-4dc9-ad80-e6a319064c5f/rosilufewijeri.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/jiwunoruvanamiguwezariw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bb608f-2995-46e9-98e4-fcca200c15c3/how_to_produce_music_for_beginners_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df666fd6-406b-449d-9a3c-2193b3c641f6/gatakezuxibexikawerubela.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_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 5356 bytes
SHA-256: c451d880521bd72fc74421134b81249a1887c661ab6e3f01ffd54ca42497409c
font_01_sfnt_off00012de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 11820 bytes
SHA-256: d23cee3210ed956ef24e8d51e905b9a794ff5c3596bbca9cfd39370b32d54a3f