Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25c8c3b094370e1…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 08:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c6242160989f4bc6368c906d86ac09b SHA-1: c3a8d2b0199465a2f4668ad909c9a92c241fb5e0 SHA-256: d25c8c3b094370e11388c7f9b49167b16f6d83527d8d98acde0b9c27cb33e215
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru', which is associated with a link farm and potentially phishing. The document's structure and the presence of many external links suggest it's designed to lure users to malicious websites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/123?utm_term=android+textinputlayout+error+space PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fcab911a526b.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/ixhew18/super_red_ball_game.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/jcFCZgj/file_manager_apk_download_2020.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/geometria_analitica_nel_piano_formule.pdfIn PDF document text
    • http://ladidoxa.iblogger.org/90206786965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5fdd68c905f1c.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/idjeidK/marooned_away_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/hbjbhd6/7227824275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_602f797147f90.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/dhfggLR/tojis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_602ba2b2a4e3e.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/benesineki.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/FLShdhi/97890027457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_6025910845399.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/jikxWnD/hollow_chocolate_ball_mold.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemadetuv.rf.gd/zekunubujomuxaxav.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/1971517488.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/how_to_get_free_redeem_code_for_free_fire.pdfIn PDF document text
    • http://vaxokepa.rf.gd/sat_subject_tests_practice.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/38317621705.pdfIn PDF document text
    • http://jowosos.myartsonline.com/stock_market_closed_today_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/chemistry_dimensional_analysis_worksheet_1_answers.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/20978713605.pdfIn PDF document text
    • http://zazedosipafefu.epizy.com/bible_quiz_fruit_of_the_spirit_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/miwine.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_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 5224 bytes
SHA-256: 137038b61e33cae7c266b49d094910388259fa084c523446884056c9c8e0fe43
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 11856 bytes
SHA-256: bad00c03a7f9596d7347f912a2d34a0c2ad873081de40e108bc4464ab07a520a