Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd71a80da9b6186…

MALICIOUS

PDF

54.0 KB Created: 2021-10-03 17:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ea429aaee257bae73233a3d95d1d42d SHA-1: 0aa4f07a889e4b86579542773c0efeba720d435d SHA-256: 5cd71a80da9b6186a387863ad4dc15d9410df4e7e975fde919e2587b860a8c9e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. No scripts were extracted from this sample, but the extensive use of external links suggests the primary attack vector is directing users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8205

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://oniceh.ru/uplcv?utm_term=best+japanese+action+movies+2018 PDF link annotation
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/55035244641.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/xajesipu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109171257588269.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/77688560973.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/fuvetax.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/69724824832.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/95416772865.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/makavexek.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/63015738962.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/81047051904.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/21583936767.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/milililiwi.pdfIn PDF document text
    • http://tdbm.vn/upload/files/surefefuk.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/54730689859.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/majetivomotivotowajagoda.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11026027266.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0ocrb5gupakrskai3u1kndesn/jukeropa.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/73219475845.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/1194721896.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/44513440044.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/38382787954.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/kapisir.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/wugubotolagamaduporu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 11140 bytes
SHA-256: 848b5350ea42790b13da2bb306db5a3f09aab7c3fe25b9e30149c31b845f2830

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