Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba9de1669ebb6b8…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 02:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd9f9c91a2aafa27b215cf1d46d7bca4 SHA-1: 0cccae6bde6f4ee8ea6e735923d9c8de23e00633 SHA-256: 2ba9de1669ebb6b84b94c755709604bea639e3feb7aba865d3da08fbdb7043b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the embedded links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=free+spin+coin+master+hack+link PDF link annotation
    • http://kondicionery-vidnoe.ru/upload_picture/file/xujitakati.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/dukigabolipufavopexujev.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/tirakuwosuzaguxotuf.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/66227278990.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/4386187953.pdfIn PDF document text
    • http://infracsap.hu/files/file/69346211142.pdfIn PDF document text
    • http://gro-felix.si/uploads/gidexesomu.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/fadezafufejotewupi.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/72282118939.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bunedikilikokapemoju.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/nufajuvokewaz.pdfIn PDF document text
    • http://hocomesun.com/upload/mepowomorekovanoxobevetu.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/20718941900.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/vidalaneseror.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/75864242679.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/88009446681.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/24830399510.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/lofijekig.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161335671c0252---42794893005.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210902132913_1071783210.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/80700203270.pdfIn PDF document text
    • https://braus.uz/images/shared/file/8471105581.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fc03f591---69797772480.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/71034988388.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/revuvazo.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_off0000b5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BC 10708 bytes
SHA-256: 26eddd0a0c2759c87e14a9644d7483b6ce7bc4683ea9a9132e942f16ad9d6c93
font_01_sfnt_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 17204 bytes
SHA-256: ebd9782e2ec024dcaa8a8176c96c9ed5dd7974d882fd6dba4e658fed872e7d44
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1