Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c72cc20b4d6b0dd…

MALICIOUS

PDF

76.0 KB Created: 2021-03-23 12:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 31b22afe72c63fcd38f41d856fd30ea2 SHA-1: c24a50718b17c2dcfb3d79627d34efcbe9f210d2 SHA-256: 4c72cc20b4d6b0ddb5e3e5b228ddfde78e128d07ca10409df84bcad3c8cf7453
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a potential lure related to 'sheet music', which is likely a pretext to drive users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/123?utm_term=let+it+go+trumpet+sheet+music+free PDF link annotation
    • https://cdn.sqhk.co/mebozesilo/SLgdDjc/solar.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/rapabotuwizem.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/ehhEjbI/java_swing_plugin_for_eclipse.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/XjfYphf/guxovorejixidezo.pdfIn PDF document text
    • http://giwosesupalu.medianewsonline.com/character_traits_poster.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/newejejaf.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/compendio_catecismo_de_la_iglesia_catolica_descargar.pdfIn PDF document text
    • http://toleritikujomuj.22web.org/96282348146.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/j8dnPOl/free_music_download_for_android_apk.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/23da8aed07.pdfIn PDF document text
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/c6e50.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/qfgizDT/knight_solitaire_ps_vita_rom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefovu/pdf_book_reader_device.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/nortel_networks_phone_manual_t7208_change_name.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/8927574404.pdfIn PDF document text
    • http://malinaliwul.epizy.com/27863387995.pdfIn PDF document text
    • http://nokafifebezazo.rf.gd/ayushman_bharat_package_list.pdfIn PDF document text
    • http://sawujasasit.epizy.com/luvufezawazedobev.pdfIn PDF document text
    • http://guvodakar.epizy.com/limiting_reactants_chem_worksheet_12-_3_key.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/nanipuxoribubugepifeso.pdfIn PDF document text
    • http://figupowogo.rf.gd/data_structures_and_algorithms_interview_questions_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/bruchrechnung_multiplikation_und_division_aufgaben.pdfIn PDF document text
    • http://fasevebozumip.rf.gd/mutun.pdfIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/nutekamileveta.pdfIn PDF document text
    • http://sovizurimi.rf.gd/lugafuwekafigenuremi.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_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 5128 bytes
SHA-256: ac02cb3842c4987d8ed52ae61096251002aecf178f7fb3cfbfe71b435dd851a4
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 11376 bytes
SHA-256: aa4716a2d6b4e4896cf54318c7aacaf313a6bbce918b4e103a832a41632c4d8d

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