Malicious PDF — malware analysis report

Static analysis result for SHA-256 303b09650906c8e0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 07:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5d2b2199d2734f0ffa9a17a03900388f SHA-1: 8dc15e5b6c9617de5263946e642f1f3bd93ebdbc SHA-256: 303b09650906c8e05614ab4451af844868bdb86d719a1e93c91290cff7528da7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this being a malicious distribution point. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence score suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://adasms.fr/userfiles/file/zodorote.pdf In PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/xegudavolojiv.pdfIn PDF document text
    • https://irrisyst.eu/files/file/wufetuberefafazifokagozo.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/jineveda.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/vozojukajoxas.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613613718ae11---lideri.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210908011923.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bodafobomuf.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/87365940437.pdfIn PDF document text
    • http://rurisnet.org/images/file/gepabetomewekogap.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/75077776181.pdfIn PDF document text
    • http://thongthien.vn/upload/files/mukubopedaropakalenedum.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/mumuz.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/moxexejinukipumedomuso.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/kuwub.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/nupozolobibodepes.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/29135536632.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/17908624477.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139298d960b0---wisiwukenunejesukodivi.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/pejuzidenenipogijagerikuv.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/98090411508.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/24508696551.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/nurawegofinoloniz.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/faxejagupofulasune.pdfIn PDF document text
    • http://bastola.org/userfiles/file/73805400223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=future+husband+shayariPDF 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_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 10508 bytes
SHA-256: a8e1aeaf29875084afef0fae2e2afe3d5c07f83731b38328e116bff2e58dfd94
font_02_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 20132 bytes
SHA-256: 9213f26f759f5cf34ea4a7ab5df993355a37f4a0918f9bc590acfb19f159ca2f