Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5cb4d6e00c5420…

MALICIOUS

PDF

67.9 KB Created: 2021-09-20 03:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 352e0e7b8e311e3e72638efa76f9f90e SHA-1: 32e13a1c79fd85e20d45f8d3fd8fab6615a8a048 SHA-256: 7d5cb4d6e00c5420cb7827a0f9ae0f6d93ca9026a709da03d9077843fcd8d42c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common technique of using embedded links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

Heuristics 4

  • 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
  • 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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec45508a3---podesisutoza.pdf In PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/dukakebag.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/wodutepopidebulana.pdfIn PDF document text
    • https://megashina24.ru/files/files/defuver.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/85189251093.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/83558715461.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/78998489287.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/73278078956.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/28484464130.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/13541383898.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109011954079945.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/59424492747.pdfIn PDF document text
    • https://anup.bo/images/files/dusawurimowabefafuz.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090319265114.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/fosifosumuxodisufunelivif.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/leludidikubeb.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/wisimigupugivizigemimu.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/33960906323.pdfIn PDF document text
    • http://umartravel.com/files/nojepixu.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/bilelodali.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/kewabene.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zezevobatajewus.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/rarosavotuvo.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/87218045132.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447c068e5a5---tegodib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=palm+hunter+x+hunter+chimera+antPDF link annotation
    • 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 17220 bytes
SHA-256: c61c0d998c86f883412714e1fdd372c7634ec7831348eb3c774fe041f2f280af

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