Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fc84790775adc6…

MALICIOUS

PDF

65.1 KB Created: 2021-09-24 13:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ede63fd37a7f6c870eb15ad26934d8b5 SHA-1: 35a34c91bf7ff9e85e6212aabce6e9a259b278d9 SHA-256: d6fc84790775adc6d32990250632c1a2061e30cd07a58759f2330a24270dab81
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest the document is part of a link farm designed to redirect users to potentially malicious sites. The ClamAV detection further confirms its malicious nature, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2988

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cuatudongsaigon.vn/uploads/files/66844937146.pdf In PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/beruronutemokonule.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/78402914280.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/63093586861.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/buxupuwo.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/jidozologo.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/43336595402.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/bukixulunasesilifugu.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/vonavudaveromumujadofaf.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/xutozokixagogivonaj.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/10487412852.pdfIn PDF document text
    • http://bscartridge.com/pic/tuxutazorodetafiz.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/7623944685.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/gafufozipelezi.pdfIn PDF document text
    • http://anninh247.info/upload/files/lekabibimezap.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/zurokogejasikivisig.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/lotiborolal.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/49235245474.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8596c9ace---5318620874.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/fopajezaxefu.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/wofuwatebewigop.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/20016425780.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/94894119333.pdfIn PDF document text
    • http://fitviewer.de/files/file/zovenafalusam.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/061248567010.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25324845917.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/89617963743.pdfIn PDF document text
    • http://sentai.cc/data/file/20210901_100309_980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chrome+always+incognito+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 11048 bytes
SHA-256: d8ce5a1ab7c37a4afdf76e2a17ff8c06fca91357af9cca48b6b9110404f63a53
font_01_sfnt_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 14532 bytes
SHA-256: eb9994b3dce1453e76de3dc442ba91873d1b8487da8579e4772b494cc7bc8f65

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