Malicious PDF — malware analysis report

Static analysis result for SHA-256 395a6a69c6d2fcb6…

MALICIOUS

PDF

80.5 KB Created: 2021-04-21 11:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e4150337f921ffc21bef9249ef05322f SHA-1: 71ccc1c7f2594f96ab61937058ceb30bc02d55dc SHA-256: 395a6a69c6d2fcb6e07a503076356c89405b5f100e8b259ea24cc17a72d4b708
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL leading to a suspicious domain that appears to be part of a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+size+does+brandy+melville+fit+uk PDF link annotation
    • http://narawodosure.medianewsonline.com/casting_process_types.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/ajjUFaE/gakepeden.pdfIn PDF document text
    • https://cdn.sqhk.co/salifera/D7Hpieu/vusosokudukogurofip.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/hdmciiR/flight_tracker_jfk.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/iiojiGD/c_language_questions_and_answers_mcq.pdfIn PDF document text
    • https://cdn.sqhk.co/tunixomaj/hjidjdw/8267777627.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/active_passive_voice_exercises_with_answers.pdfIn PDF document text
    • http://fiselijuduguge.iblogger.org/carbothane_134_hs_product_data_sheet.pdfIn PDF document text
    • http://ratedewu.scienceontheweb.net/bodas_de_sangre_analisis.pdfIn PDF document text
    • http://lirifajo.sportsontheweb.net/bridgman_human_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/jcDMjf6/canvas_student_pcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/maniregujo.pdfIn PDF document text
    • http://rojegasofibi.epizy.com/sword_art_online_progressive_anime_date.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/47840873838.pdfIn PDF document text
    • http://jefokilekik.rf.gd/nubojixixesalafaw.pdfIn PDF document text
    • http://jupukatovukupi.rf.gd/frecuencia_cardiaca_normal.pdfIn PDF document text
    • http://loxosonupod.rf.gd/1921492413.pdfIn PDF document text
    • http://gisobugiwe.rf.gd/investigation_13_enzyme_activity_lab_report.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_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 5576 bytes
SHA-256: 676a21ed6d3bed98b0c9d8b6826350cc8697ba4b5ac644298a7bfab61acf5540
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 11036 bytes
SHA-256: 8d941564c3f9b34695fd2a78d2a62db5e49115e59c4df4fbdaaf64341394d512

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