Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a8742ba29ec476…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 09:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c07c8d663457db421792fbf254945fba SHA-1: 3ce313789e73e403abfec2a14ef6eda571c22a76 SHA-256: 33a8742ba29ec476a8232762dae5f647adc69a235f4303e069f805c961c8d223
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by redirecting them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=android+bluetooth+audio+delay+fix PDF link annotation
    • https://lalicorne-hotel.com/userfiles/file/wilidan.pdfIn PDF document text
    • https://norservis.com/files/files/fobobivelofuk.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/degafinaketarekewetibof.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/nojiwu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/lovusaxedewijo.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/876468990.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/xipuzotibutenugusekirep.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/fejazevutorujumamajek.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/fegumekida.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/vovanuwekugapimovemud.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/36133333437.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/simifutedaxabezuzonobu.pdfIn PDF document text
    • http://megalaserasia.com/upload///94650358362.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/45069377657.pdfIn PDF document text
    • http://ocung.net/img/files/mekuwawoxikemisajakori.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kunafusopaxevubenaxigezij.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/84117334973.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/88045608433.pdfIn PDF document text
    • http://skupka23.ru/upload/m/5301339106.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3ea8a963d---bodapekatobadu.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/406978764.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/waxezuraluraridi.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/27121671387.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/19911675794.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/luditoponuf.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_off0000b389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 15488 bytes
SHA-256: b78faf525857265b78dc185f3bebcf04d63a39a9b9a1493706bd0f2fc2a7197d
font_01_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 10720 bytes
SHA-256: 6b9b4220fc5a70569b38b3da6d79b8ced515a0157c36dc5705a8870aae7a8523
font_02_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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