Malicious PDF — malware analysis report

Static analysis result for SHA-256 5427c987a3715745…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 19:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73c806989052994eaf9c9a930090f0f3 SHA-1: 5dde29375e1cdf174fd6d52264934d0be664a2c7 SHA-256: 5427c987a371574562700420de580dcd38f0a362f9f030c1441aec92f564486c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute phishing lures or malware. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=verbeelding+bouwbesluit+2012+pdf PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/97641246082.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/nevogaxa.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/41019007361.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/mizosodibokugipe.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/rejobarobunujagiz.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/jejapeviduzisaze.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303b9868bc2---6785882564.pdfIn PDF document text
    • http://m2m2design.com/userfiles/xavekadiwufijo.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/84375814717.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/7508094612.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320e6e2c299---tawufetefi.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/jirafudawusavilenirotaxil.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/11128727660.pdfIn PDF document text
    • https://uudanbury.life/files/file/3448305666.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/6067870327.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/kevoxiremejifikogawe.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210905_040915.pdfIn PDF document text
    • http://goldmustang.ru/files/files/73498722687.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/75751287621.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/41718287605.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/takero.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/nuvakijarafewage.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/42980616047.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/86919234756.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/13699878990.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_off0000b782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB782 15420 bytes
SHA-256: 150de0a0c64914fc053fc3f11b30f2aa17edbcb35518ad9dfda2097375d8e9ab
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 11100 bytes
SHA-256: f8d7eaa5a9c11659ffb18bc2878e6dc31d0515bfd02adc19e80ddc5d0d4624cc
font_02_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1