Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbb9df37593f6d6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 05:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2404c40a0d46db09784e982f8ad6b226 SHA-1: 946fe7199efa64db97d2384c430cc5f8bb4a745e SHA-256: 4cbb9df37593f6d6c0f3c97f6ab954d1b41395775557aeb8ccfc7613082fd8ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=android+10+for+redmi+note+7s PDF link annotation
    • http://tfe-design.dk/userfiles/file/9102868873.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/wukipawel.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vumurirewolaki.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/50450473672.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/guwete.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/6487962449.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/37434962324.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/37408443656.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/wenemegebato.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/53062809724.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/77700432268.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/xoverimurewawadanexesuf.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/80986713325.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/38042183995.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/75455516857.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/gubexaxukakajezukid.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/jafavibawijelubamijip.pdfIn PDF document text
    • http://tencanpowder.com/d/files/84953115495.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rpmembkhi5t53poo4d55ra7ig7/demavexefijusasa.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/relepunolowevojadev.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/tijuzovavopepuxuvebevasu.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/tudipatan.pdfIn PDF document text
    • http://balone.net/_upload/file///52569930000.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 18368 bytes
SHA-256: 095933e88d65012722326d30e47aef52efd99126f3f77fcf62de737cd6ebaf0f
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 10512 bytes
SHA-256: 4353eefd9e416daaec76ca2ca3996554ca19f7735d8b62201d0464e0733e840b

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