Malicious PDF — malware analysis report

Static analysis result for SHA-256 6235bac36eaf784f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 01:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e87144a9c09541b8201d832e2212774b SHA-1: 3bc1fdb374efba790e8fee0d4ee90f3495deb7e3 SHA-256: 6235bac36eaf784fdb077bae41a4053f2ea1e90ba57f68960ef67799d7b8f8aa
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 link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tbeaindia.com/userfiles/file/besaninoxujakev.pdf In PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1105745265614503bfac35b.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/witido.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a388b1896a383c25eebb34b4f3b22c4e/19153030972.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/sawutesimiretege.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/topexemevisuwalimiwuxonir.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/20384703079.pdfIn PDF document text
    • http://santeh.md/img/files/mumoxiben.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/8328736506.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/rexuritejitofibopubamode.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/9229382744.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/5468001925.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/tiboke.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/48612494218.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/kutadiwuzogi.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/maxetanosetodexalopifu.pdfIn PDF document text
    • http://vaithun.net/upload/files/lugepu.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/1036243087.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/99460764930.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16140c52f05f6d---64963713282.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/95221129185.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/liwexosaniribamosoxemeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=note+5+pro+miui+updatePDF 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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10448 bytes
SHA-256: 93205178ce912349405ab30b786450b18ac98618dd6f24c10b355185bf73e252
font_02_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 17620 bytes
SHA-256: d7b93b676267ac9c0b9e6666a9845b75048228b32fe9cfe76ef2e97a1dab2f1b