Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1afbebc8208eac…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 14:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c03550cf966396a9f83f1e1d49c4c0bb SHA-1: 6c56ad1dc01202db04cb9ea86b14636c59e98017 SHA-256: 0e1afbebc8208eace8582c53d7696aa2a18174bffb7b17f16ad820404ea50b76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious intent by using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=screen+border+light+wallpaper PDF link annotation
    • http://millecolori.it/images/file/jugoxarewedeb.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/pabidetuxe.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/4721245470.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/3070186550.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tojufavujepexeriz.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/je1fhch79lq6bvi606mvn7rae4/48459571950.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/82956172816.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/fuxoni.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/136997584.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/favulobugulizivifelize.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/maluna.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/domikivimeb.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/98836516830.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/95402714716.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/41975294097.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokalebuxifabixug.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/butelisafefixorir.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/beforodotujasegako.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140f471edff4---20777027794.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/daruwovakadaxojuvogo.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/jilezilataluzukawat.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/gufowototirelaga.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/leneminaj.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63502251244.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/79837487878.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/nijex.pdfIn PDF document text
    • 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_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 16252 bytes
SHA-256: 9b7417aef1e12a9052bc1531e2c3ff925536c889ec25242d4f233d7503deae90
font_01_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 10928 bytes
SHA-256: fde222f8a6b606ab31209354b8ab745dbfeb2536ee60d80abe79c28f3d599cd9