Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad8fc3bb8730ea5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 17:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b6b902651bc539e290ff7304e9109b0 SHA-1: a90c6603e9f9f48a9a99fc1cabd29ed243416920 SHA-256: 0ad8fc3bb8730ea51a6ad62f45e27a5997531ccade440b711614ea4b5e5332a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or unknown domains, characteristic of a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/148a48aa95b8f5ca73d94f691b25a96e/bubunejetukaju.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/38ceomu210ee0noivv5j9ls6ms/biletanofufunifitur.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/69266249988.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090208362975.pdfIn PDF document text
    • http://someteme.com/archivos/_20210917205117.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/72587909943.pdfIn PDF document text
    • http://mc-opony.pl/files/file/nidiwa.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/rewibevavipuj.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/rifosamiva.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/75259341822.pdfIn PDF document text
    • http://metabolit.ru/files/file/latuf.pdfIn PDF document text
    • https://phuquiland.com/upload/files/55290108088.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/87240695912.pdfIn PDF document text
    • http://soc-in.com/data/media/files/19549316002.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/bureri.pdfIn PDF document text
    • https://equimat-cheval.fr/file/pawoju.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/61152255856.pdfIn PDF document text
    • http://fitviewer.biz/files/file/83026691926.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/kiwujopexar.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/2073062874.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/70887627503.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/78332461195.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/mitoxifejagedezorajipiker.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/48319306518.pdfIn PDF document text
    • https://fultoys.com/userfiles/2534767896.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/67162579162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pair+wiimote+with+androidPDF link annotation
    • 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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 10388 bytes
SHA-256: dd4fdc03f06cc55b2f0bfe9c72754cfad8b3bb68a0481bf379bc89f934cfdd0a
font_01_sfnt_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 14972 bytes
SHA-256: e9f1114bb51f647d0cfff0ba0f6509874745fc4c63cc4919f783e3392ebbab49