Malicious PDF — malware analysis report

Static analysis result for SHA-256 505fcd79e98d7257…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 16:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0ac0f17a02267ab2a9f34bb8c5172fc9 SHA-1: 60dbfc12d5676c97cb64bfb86c7a6377bdc3d1ac SHA-256: 505fcd79e98d725774d776bd00e7b53592f9083e4a883333feb23731f7cc7bea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or point directly to IP addresses. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=movierulz+hd+movies PDF link annotation
    • http://phuketdriveschool.com/userfiles/file/bijumivugibobijowiki.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/93054603373.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/fawiturazagetinaxix.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/mugimafujovurategole.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xalotirure.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/53483161849.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0225716001630554424.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/21969540979.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/90801897742.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/mozigomoxasufuxapabe.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/fijegebatad.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/45342717360.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/94662961434.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/zipamorugafuwoti.pdfIn PDF document text
    • http://potlista.com/file/files/lelimamuveteselexafali.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/89404434755.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/zewukam.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/95807853051.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/vejijurobuf.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/50454964573.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/58088781378.pdfPDF link annotation
    • https://www.food-equipment-store.com/fckeditor/uploads/file/lawobaruzof.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xufuwapubusinarumaj.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/39841770399.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/kuwiromunipezujunasep.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_off0000b30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30E 10368 bytes
SHA-256: 5d6a8774e23e0def4261277797ac3f43341fb06e48f533918a3f2edb98e16856
font_01_sfnt_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 16240 bytes
SHA-256: a72c46a5d2015ba180d30254ef8277f365b341a3c5a0c7947a3e13dc1787d60f
font_02_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1