Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d0e26555f2d2b5…

MALICIOUS

PDF

65.1 KB Created: 2021-09-09 01:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e654838347ecda688275c4d94f8c8c9e SHA-1: 402e37f6a2723d483e8d919add43e3a00c4ca310 SHA-256: 81d0e26555f2d2b5fa854fec8340c7578f54e41b87a7b56788dd2a6ac49d86d2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or SEO poisoning attempt. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a pattern of distributing links across many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

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 http://labonscafe.com/userfiles/sutusuwubijojikopojujopo.pdf In PDF document text
    • https://quangcaowebsite.vn/uploads/files/52198207418.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/95166622673.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fotimiro.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/poviwipimumerawabazewuv.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5309105d---25305660063.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/80787891657.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/64678330393.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/mazogirupebujot.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/82332852342.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/87502132319.pdfIn PDF document text
    • http://keyday.ru/files/files/32543685993.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/35797273377.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/zagefaguwivezeje.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/12875711560.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/92286639566.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cek8gd7rho0bla2ik7jo032d38/77522941971.pdfIn PDF document text
    • https://theurbanthinktank.com/files/losumuxu.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/wefizusuwiwulozuzepevavur.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/4078535207.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/wapesere.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/zaxavirivikuxoxixusewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pes+2015+psp+iso+file+downloadPDF 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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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