Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9ae43c4acb424e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 09:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d19e205c43120b0650ec67c1d345afb SHA-1: 8ef2ad04cefabf7d090d145a10f60884afe9d916 SHA-256: 4e9ae43c4acb424e55a1fc4ac10284c03c123468ebdc7bf3c85afc4077be8eef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into visiting malicious sites or downloading further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://al-wesam.com/userfiles/files/gigutijunasujadizafera.pdf In PDF document text
    • http://www.pvvc.cz/files/68199094626.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161345c8cc8a6a---60667969548.pdfIn PDF document text
    • http://plise.org/userfiles/file/jilapinaf.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/vukewe.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/55372704222.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/364512617.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210917160127.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/33919602546.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/nevadokejagizu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/diwedaxutesazal.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/30620901983.pdfIn PDF document text
    • https://shibbirs.com/media/files/faluragejuporitegivumotil.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/powemazibowivukime.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/50315012995.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/83722380411.pdfIn PDF document text
    • https://mollis.rs/files/xugetesonulozaruti.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/kekawekosodo.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/sizukuxetovuwibodapap.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109151810342336.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/banenadimu.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb2b8a95b---xarimu.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/mitajavibuvizosisu.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/xamujeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=harry+potter+full+movie+download+in+englishPDF 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_off0000bcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 11304 bytes
SHA-256: 69db3420419d2c641deb837dd3351bfc1ace89e71f232980d6b474f05556569e
font_02_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 17776 bytes
SHA-256: 70249de8421b03401c30b140bba1e11443f5921f6a9a024e5f5ab9a0769c8848