Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26f2fbc55d3e818…

MALICIOUS

PDF

76.7 KB Created: 2021-03-12 18:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 20c358c62d65a9460f7eb3c80ac17b3c SHA-1: 6fda17db19f3748e7d0181fc1be052f24221de3a SHA-256: b26f2fbc55d3e8189617ebc778c4f0f8c123a71dfdd75da9571c8ffa1a24472c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly leveraging PDF vulnerabilities or social engineering.

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://baarspo.ru/strik?utm_term=what+is+the+theme+of+the+story+annabel+lee PDF link annotation
    • http://jalatuxu.iblogger.org/dota_auto_chess_assassin_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/0YCijXR/screen_recorder_app_for_android.pdfIn PDF document text
    • http://doxedisipi.scienceontheweb.net/l_anatomie_de_l_homme.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/fuxiwinuvevebogitew.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/bCZicr2/lonila.pdfIn PDF document text
    • http://xemifizodagavub.22web.org/fipoj.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/KYlVDjj/ximuzej.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/zijirixujemugolija.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenilu/a3YOGIf/donexalojed.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/saxitotufozoxikojowapugi.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/jnKeicY/bubble_shooter_genies_level_107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumobopebog.epizy.com/how_to_connect_epson_l365_printer_to_wifi_network.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/calligraphy_worksheets_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669c6e65-701e-40df-8320-ff0b3bb0f113/how_to_run_3_phase_motor_on_single_phase_power.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/50558577972.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/lyrics_for_seven_years_by_lukas_graham.pdfIn PDF document text
    • http://zunaxixe.rf.gd/holt_mcdougal_larson_geometry_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0b39e0-f08a-47d9-8a51-ebec4a94b640/rebadavoxiwelapuju.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/cardboard_furniture_diy.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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 5260 bytes
SHA-256: c50b70b2b4b6945157f4887ee0cf99355b1fbe2a16ba069ce24c7c3debe77988
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 10980 bytes
SHA-256: 392f820a17b90bcee6f304d7c0511a8724207f81db9dcbeaab7240b0af2a81a0

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