Malicious PDF — malware analysis report

Static analysis result for SHA-256 7207b3b3c88a7a2c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 16:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2fbef916f77f5a7c6021cd39a19cb341 SHA-1: cf7de771463b3c19c4bdb36941be065cb5dc946f SHA-256: 7207b3b3c88a7a2cdf2d684b93d2d9f3dbad30f6ca0d1c024792c1fbafaa72b4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a social engineering lure to install browser updates. This suggests an attempt to trick the user into executing malicious code or downloading further payloads. The presence of numerous unknown URLs, some linked to disposable domains, further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ikincielinmak.com/upload/ckfinder/files/58313866028.pdf In PDF document text
    • http://speed-r.com/js/upload/files/xovuzifil.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/20253357546.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/ketinokowidugik.pdfIn PDF document text
    • https://mimpishio.com/contents/files/sesisujawak.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/75096914021.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce430c0ae---lozesig.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/95061404479.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/23922631497.pdfIn PDF document text
    • http://splogservice.ru/content/file/83714918148.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/dejexukam.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/jaxin.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kamitedagilifumuvome.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lodikuweronirexufojuxofep.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/37790928571.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/vukaxixifiri.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/999353195.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/88090449032.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/65667699163.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/tujojifudagup.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/90305570325.pdfIn PDF document text
    • http://cecev.com/stockages/files/wimowawap.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jevupefitizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+pc+building+simulator+for+androidPDF 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_off0000b141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 15648 bytes
SHA-256: 61c2265210cf2a31760e3d25f86ca907eaf1c59069b235d71ea90d3ae766d5ad
font_01_sfnt_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 11160 bytes
SHA-256: 9057af23f8d3f9f54da9917229f84ed43556bdbdcbff5997444f1b17a2716a93
font_02_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1