Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d85e1b08f24ac34…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 10:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0175d4dfe5c0bfeb7188d7ce581822c SHA-1: c14b5d2c46a4de1df25d14e921a260044461d96d SHA-256: 8d85e1b08f24ac34e231d8ebf77a2e8606ff758344e708eb925ce520cffdcdfc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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
  • 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 http://lacasedescaraibes.fr/file/dofajer.pdf In PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/49473379025.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/82746987623.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613045e24b3a6---35711225930.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/dojapijaxivipusupuzixosa.pdfIn PDF document text
    • http://atrsara.ir/resource/files/39858526108.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/dovidepedebiga.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/98658666745.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109101519197666.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/31974454779.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/96819861901.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/bevikogowoximekakorofen.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/41948200630.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/vovujelurifegawojuk.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/16212563973.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/59911447824.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630737209.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forewajefavuwodukobabu.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/bexavolajopese.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210915_D790813C0F75D764.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d52d1dc6---tixulusalitunobaxesefima.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/82565007630.pdfIn PDF document text
    • https://somogyplusz.hu/files/sokajasujerowaseropewiz.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/70977165322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=top+10+best+emulatorPDF 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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 16468 bytes
SHA-256: 34333015c30c630a7177968de2f46784dc283acea01aa78860db91a83897c6b2
font_01_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 10596 bytes
SHA-256: 6fe1cc66cf82bdfa778e808914d069969b1b426fc2dada2a0db1f8db636e2980
font_02_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1