Malicious PDF — malware analysis report

Static analysis result for SHA-256 332e43eae1ef22b4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 14:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ed088ffa6d32e30cec65a09fe59cde6 SHA-1: 43b60da3814b9b1cf211d402921abfe9164b369f SHA-256: 332e43eae1ef22b4fd14c896d84b1d08779793c2783bf709e96b411c7e876573
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 hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://topupdana.com/contents//files/52959540874.pdf In PDF document text
    • http://chapelguild.com/images/usr/95207223593.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/voxapizaki.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/bonobaponosorogawukajug.pdfIn PDF document text
    • https://amblamy.ee/upload/file/bumenabuwexad.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/14217984502.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wasimavozuwidubomuberip.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sigiliniz.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87350709392.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/lovekivuvuvalis.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/25468269360.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/41661129311.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098acb57e0c2---lidagikowawufakav.pdfIn PDF document text
    • http://adveotec.com/img/file/siguraritidukaf.pdfIn PDF document text
    • https://flyags.com/editorResources/file///77564803710.pdfIn PDF document text
    • http://thedreams.cz/files/55999377450.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/guvojejalivef.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/nedikolofonazipo.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/58297577811.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/fetazibuzigosu.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/51522647650.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/junepotapoxilagotas.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d3846a6c570a91618126549045d56b7a/3566259785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dyce+anatomia+veterinaria+descargar+gratis+pdfPDF 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_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 17684 bytes
SHA-256: 0836f6b668a36a460355504746094b5a015c16e6eff6adbb0a17e8d85d19dc7c
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 11096 bytes
SHA-256: 4c345a8d371d260b5359e6e904d75f6ac04c0f160397a7c61444adb7317a4189
font_02_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1