Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d524ca00adc058e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 05:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 582865d4da3a346153fbe8e0d6d4220c SHA-1: 140c746b6c3aad6497b6010149821ac71743a265 SHA-256: 9d524ca00adc058e1d8e02981f9b702841ef07540cfef97dd9d47d3a2e9346ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme. The embedded JavaScript is likely responsible for the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laduses.nl/image/file/rizuliruvutot.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/bibigopebe.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/97775968919.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/85414186534.pdfIn PDF document text
    • http://irinabailey.com/upload/files/kexozokujuwomufalafopip.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/86556184341.pdfIn PDF document text
    • https://eslms.com/userfiles/file/fenapegabilavezoje.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/38844293715.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/27122059733.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/78212320077.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/donaxixogujivavipojo.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/wiveriforu.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/misage.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/67438787573.pdfIn PDF document text
    • https://chv.vn/userfiles/file/24821000613.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/nizosab.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5254d467e---35695638224.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/kokobojiwijojev.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161341096e5b89---21897702979.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/16315687918.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/1875385902.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/7565796894.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/69371411606.pdfIn PDF document text
    • http://haai.org/upload/file/58828250597.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/8708981942.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/40984092876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+can+you+do+with+dye+in+minecraftPDF 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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 17472 bytes
SHA-256: a6526ed12c03d00dd63c6b55facf71193c3639de0f5a7b61c9f9b75ef8aae178
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 10820 bytes
SHA-256: 891768fbf906176f8fa41ab196109dc491d86b365c65ff86d4c593c8398b0c3e