Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e262c2a2b474625…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 13:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b66c54188f365b2f46239e81d472b8f8 SHA-1: 2466cd840327998ac2f0a986951cf030a4f45c5c SHA-256: 9e262c2a2b474625873a3405bb50aab9ced8ea916f0634a86e8349008e8fed77
146 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/strik?utm_term=first+aid+usmle+step+1+2013+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/wobuwozavenu/fmjaJIV/stickman_archer_online_4j._com.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/jjhjsfn/zombie_smash_ios_descargar.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuxezaj/kja1gzy/how_to_bake_salmon_steaks.pdfIn PDF document text
    • http://namedaun.fun/lojapodetoviwajemoritxar0w.pdfIn PDF document text
    • http://razvivatel.blog/chemical_vs_physical_change_worksheetlx4bs.pdfIn PDF document text
    • https://cdn.sqhk.co/derixosu/ggULjeu/racing_wheels_for_xbox_one.pdfIn PDF document text
    • http://everydays.space/how_to_replace_the_battery_in_a_timex_watchyov3i.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/hXXjcXz/dubemulojadozedale.pdfIn PDF document text
    • http://catsism.com/maravilloso_desastre_jamie_mcguire_descargar_gratis79dzj.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/37653863663.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/9Qcjbjf/lucky_ali_songs_download_320kbps_pagalworld.pdfIn PDF document text
    • http://yozi.store/febuzipavomabazadatazatomspnha.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/0B3hcAC/idle_pocket_crafter_mod_apk_0._9._858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugenerefajujus.atwebpages.com/1564767455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db48d8c-4ab1-4336-b1ce-dbd8a0f4fd18/74381490985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be62f46b-9524-4efc-8d95-7a0fae1345c0/21447572950.pdfIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/is_powerdirector_free.pdfIn PDF document text
    • http://pujumek.myartsonline.com/modified_booth_algorithm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d772ec24-33e9-40b2-85a3-6b365fd38efc/sherlock_holmes_3_full_movie_download_in_hindi_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580048b4-8e72-4840-979c-da4068e25911/verbos_en_ingles_lista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d122bd-03ef-4b95-936d-7eeea3770e3f/8519096630.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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5724 bytes
SHA-256: abb7ba7a2d3f7b8c6d21863274d437db135779a465e27d9bc3ce38f8af7f6701
font_01_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 18280 bytes
SHA-256: a6401629858aca028f694c7d925ad7bd59886bc092ebf7ec7dd10bd171c9403c

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