Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce39b779ad145517…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 14:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd52d6874a96312a1e4fb3937c723e5f SHA-1: 0528c9c27117bb8c0f8df4e0103aad655f697bb6 SHA-256: ce39b779ad145517de812fd1e197e5f25807ce9816fe912461d71cef89ac5831
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a malicious PDF (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0). Static analysis revealed numerous external URIs and embedded URLs, many of which are part of a link farm on disposable hosting. The PDF's structure and the presence of external links suggest it is used to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 4

  • 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
  • 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://irlanc.ru/uplcv?utm_term=ipod+with+flappy+bird+worth PDF link annotation
    • http://productinfo.in/konadnew/userfiles/file/xamukijalevomobuxalo.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/96534741915.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/voduvisafiji.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/78642636150.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/tivixidifotitaroxugumona.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/86613138034.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/zegobu.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/46372108192.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161370e75454ba---tutipo.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bavitutavobakosil.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/27159412574.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/nofida.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/milipemad.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/vowafanudukojolapopefa.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/wijolosopab.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/76008477857.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/domit.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/26898676829.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/paxevuk.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/nusubazoruzub.pdfIn PDF document text
    • http://hidropro.hu/upload/xukobiloripavoxuv.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/6719183169.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/1331359930.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 19016 bytes
SHA-256: 7bd5d16b141ef57bb78d842beda051b5c0b17c43f56a3ab1a01e86500eb68c02
font_01_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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