Malicious PDF — malware analysis report

Static analysis result for SHA-256 872762deabab0c8a…

MALICIOUS

PDF

83.2 KB Created: 2021-03-22 03:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85b529251dea14e05e6c2ebf3b0f7802 SHA-1: f420f2541f8c0d7d1e66526775fc92952e022877 SHA-256: 872762deabab0c8a99cea8598e08ce48c73bcd2e70b9dba4b81451af8d8743fd
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/123?utm_term=pokemon+shield+gym+leaders+guide PDF link annotation
    • http://rikafitamedad.medianewsonline.com/41180780780.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/B8VbDhh/90s_music_artists_names.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/xebivupuxapapufepotademir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_604b9d6e33e0d.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/augusto_cury_ansiedade_2.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/como_hacer_hoja_de_vida_en_word.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/penny_stocks_2021_uk.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/824674163.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/etc_smartfade_1248_lighting_console.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/slaDDii/7158260790.pdfIn PDF document text
    • https://cdn.sqhk.co/kujaruwajovi/agcbgbX/puzavux.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/YbgfjgG/griseofulvin_side_effects_in_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60122a99a2474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fcf2cefa2fdf.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/jihjUm3/28716269316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fee7da640cc5.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/f69fdd40-57ef-45ab-b7f7-785b9fc3c163/292123108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fb04df-7d3c-4d88-bf98-8193ff39fba4/what_is_a_good_topic_for_an_aa_meeting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b34549a-566c-40de-bf88-e48c7848a4fe/67388549957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1d177e-fc1d-4ac8-b446-7c4ccda11e2d/how_do_i_reset_my_belkin_router_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6d2e64-7627-4e9e-b5f2-46fddd0ae82f/mechanical_fe_review_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32612630-b11b-46ca-935b-baaeb17ce471/how_to_work_a_receptionist_phone.pdfIn PDF document text
    • http://wovodijulenape.onlinewebshop.net/54299709310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544c7901-8add-4e78-8ccd-d5d505ffa23a/direpulegunuzi.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_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 5408 bytes
SHA-256: e78e0398a52a6dee17c8177a4e70350ce7c033923de035e87f3e61a9e295f2ee
font_01_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 10480 bytes
SHA-256: 876022f1f15263d0f058a8e9e64863d7a1f570155917833bf6a654dad6dee0d0