Malicious PDF — malware analysis report

Static analysis result for SHA-256 63563632049a2c0b…

MALICIOUS

PDF

87.5 KB Created: 2021-03-14 06:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aa403e296031242543b2f753731a5665 SHA-1: 74758fb1a7b785717e3e591bb5e8458b804e2424 SHA-256: 63563632049a2c0b2860f2d0c4d4ded3ea9f6433ae3aceb345580cfb2f85bc88
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 domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=music+sheet+blank+printable PDF link annotation
    • http://rezltml.xyz/kagosetun19c.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/danine.pdfIn PDF document text
    • http://laromuwutekino.22web.org/83355008586.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/4970733.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/kotewixafobavuxofe.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/veguwaj.pdfIn PDF document text
    • http://bonusiotsbera.online/bosch_classixx_5_user_manualevud3.pdfIn PDF document text
    • http://1xbet-registrat.site/kogapigd120s.pdfIn PDF document text
    • http://vezerfa.xyz/cantina_band_sheet_music_pianoxopjk.pdfIn PDF document text
    • http://fesusexixirefe.22web.org/sodisimexowovudubaka.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/a00c04c3-40be-4cce-90a6-72f80d59f248/18093130064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775dbfdd-3146-42cd-aedd-8b2d856fdb23/81835319098.pdfIn PDF document text
    • http://xuresiru.epizy.com/game_carnivores_ice_age_for_pc.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/biblia_de_estudio_macarthur_online.pdfIn PDF document text
    • http://rowesupigoz.epizy.com/81668920864.pdfIn PDF document text
    • http://damaxokabipo.epizy.com/xaxidusowonafezideripiwad.pdfIn PDF document text
    • http://zefumegidadaj.epizy.com/8901969416.pdfIn PDF document text
    • http://mevonaku.rf.gd/data_binding_xamarin_forms.pdfIn PDF document text
    • http://jupukatovukupi.rf.gd/87145610730.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_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 5228 bytes
SHA-256: 5da789a1e7d788f7eed152233e04ad21ec1bf273783466493a509b3e292da2ff
font_01_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 11180 bytes
SHA-256: 11cb9a1285b67538c82f08ceb44470fa29094b3489677b54df3618509e229649

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