Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4125ec1bff3e4d1…

MALICIOUS

PDF

77.0 KB Created: 2021-04-01 23:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32a53ac00b5d236c9078dcfd91c366c4 SHA-1: 85a0f9fcc80aa7b10f84953774bac866a0511213 SHA-256: e4125ec1bff3e4d12ec36f79ee8a8b1a1e7856e1b1ab23a2626147c7aaaa300d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9953

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://leonvi.ru/strik?utm_term=traduzione+inglese+italiano+pdf PDF link annotation
    • http://fruktovik.com/factorising_algebraic_expressions_worksheet5oqvx.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/Tjbjagi/corel_paintshop_pro_x8_ultimate_user_guide.pdfIn PDF document text
    • http://geleostone.online/dikar295il.pdfIn PDF document text
    • http://turodes.iblogger.org/mapefepudivegevenuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_603246f03a25f.pdfIn PDF document text
    • https://cdn.sqhk.co/raxinosi/igiARAR/call_of_duty_mobile_beta_download_link.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5fe78bf6534d8.pdfIn PDF document text
    • https://buzelobuledu.weebly.com/uploads/1/3/1/3/131397981/2419723.pdfIn PDF document text
    • http://hangookoil.ru/descargar_el_corn_gratisjvp6v.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/gdifGFf/carrom_board_game_play.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/jijjjhF/cnc_milling_tools_list.pdfIn PDF document text
    • http://favanitum.iblogger.org/periodic_table_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/gjididT/slither._io_unblocked_games_77.pdfIn PDF document text
    • https://muneberixiloza.weebly.com/uploads/1/3/4/3/134339704/xefuwug.pdfIn PDF document text
    • http://lnstagramaccounts.com/muscle_spasm_treatment_home_remedies6z8ic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_60609b8730253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_6042e3b413867.pdfIn PDF document text
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/1031872.pdfIn PDF document text
    • http://yognat.space/xowibuvenozuxibipafusajvoyyg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5fceaa7f71f8c.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/6179441.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/e1bd1084-30cf-4e28-8f44-4a3525faecb3/how_to_read_body_language_and_facial_expressions.pdfIn PDF document text
    • http://sebavikozatuz.epizy.com/how_to_make_t1_crossover_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f70efed-3775-44b8-8dda-e0af39d4e69d/99351607569.pdfIn PDF document text
    • http://dosafubep.epizy.com/22975987655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c86ae2a-714b-445e-b842-3750f817b142/fomamovomesubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12dd4bf-8be0-40e0-bfd9-436304599135/65370986450.pdfIn PDF document text
    • http://kuxoxulid.epizy.com/tekarixepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d16440-3c9e-4390-9292-308661b70eef/latest_covid_19_news_oregon.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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 5208 bytes
SHA-256: a95518aa764c3802e9670f44fd5b8e5d9fb202d40c7fd75356abd9ba4f0e3a02
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 11648 bytes
SHA-256: 4b9876efb53f5b41aa798ec3451e208384439454ad5faca5962c9320b580e253