Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eea0457e442760…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 20:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d14b12db2ea0c423d8cd98c0be7559df SHA-1: 11cb1515cd9a1c9e55f499dcb563c3c9e4f78555 SHA-256: 28eea0457e4427601baf2ea65645be0e7261b9549008317c7f43944ce8d58961
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that appears to be a lure for search terms, further supporting a phishing or malicious redirection scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/123?utm_term=formal+dress+stores+in+near+me PDF link annotation
    • https://cdn.sqhk.co/sadirorig/gghAGii/roku_premiere_plus_target.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/SDhe3bv/golden_ball_2020_winner.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/empathic_listening.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/ijjjjcx/13810455265.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/jjgigib/9865478575.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/j1gfuhr/codigo_procesal_civil_mercantil_comentado_el_salvador.pdfIn PDF document text
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/0224fc6d92c5f.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/jirarupijurud.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/bharcra/avion_flight_simulator_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/jfxIYKl/48781682362.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/EigTjdk/28195493007.pdfIn PDF document text
    • https://gejilesiwurulu.weebly.com/uploads/1/3/4/3/134374779/f640bd278de2bb5.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/tekilapusiniba_gelurunulo_bumevesarov_jovuk.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/nifedipine_davis_drug_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/Khfjdjc/15402021309.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/moto_g_5g_plus_review_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikowejinaruwut.rf.gd/puzzle_questions_and_answers_in_telugu.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/do_all_oral_b_brush_heads_fit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88776d42-67ec-4c09-8b70-6eaebeadb5d2/pasimebepilu.pdfIn PDF document text
    • http://demovuxogevere.rf.gd/how_to_cite_davis_drug_guide_for_nurses_14th_edition.pdfIn PDF document text
    • http://jilevatawew.epizy.com/75436743263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a86b01-89b8-48a2-9db5-331cc62d075e/rainbow_e_series_power_nozzle_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55829cf-fde6-4b92-b94a-dd781ac9d5cc/pixma_mg3122_printer_wifi_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8550267f-4e55-4809-bb85-58c9589e6299/fantastic_mr_fox_soundtrack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8deb51d-e33b-421e-90d0-55c39f5268a4/watch_beasts_of_no_nation_online.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_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 4928 bytes
SHA-256: 53a656eb0ea31c8be7eceb3404a0fc9520a8232f8cae3c25da618094c247ae06
font_01_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 11168 bytes
SHA-256: b58d98e5d2ab58af9d00189dadd2573e60cb5f385b4aae4157fb6bc27178a422