Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde5fda4e3d8ec79…

MALICIOUS

PDF

74.0 KB Created: 2021-09-14 13:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36c3c30cb8f46798c28db5266cadb8ce SHA-1: a90bc4db54623b5625fc006ae83d66e25c54eb24 SHA-256: fde5fda4e3d8ec79be79e29fd710e9516eee4f26d55ae35894c0ed818c59ff99
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm designed to trick users into downloading further malware. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.andreivieru.com/ckfinder/userfiles/files/725384022.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/cu5p5gsrovfsbirr2op0b06qpk/sadanodemarekinaso.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/zewonojojidesovowa.pdfIn PDF document text
    • https://suncables.co/images/file/dofuzenunavowag.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/26638155545.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/89248242971.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/nidepezozumaxopuloguvup.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/janarokopirilazeti.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/43721996315.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/27460361348.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/zasegejekowajapolugikiko.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fb84dfcb---55123507506.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zudamef.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/lojujaduvaxef.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/96986224654.pdfIn PDF document text
    • https://istanajp2.com/contents/files/wejidofujuvajajere.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/petesitunubepurofu.pdfIn PDF document text
    • https://efnnma.org/files/file/pituzomuwujo.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/vawew.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/57626630958.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/44193688039.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/17135755046.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/jetafexabekibodigaku.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/78966312919.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/lufuziropebawojijoz.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/18514424538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=movierulz+english+action+moviesPDF 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_off0000bc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8E 17000 bytes
SHA-256: c559ca8ab846480f56990b28a93891a2a41765cc1aabb7e4af9f7946a961c530
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 10896 bytes
SHA-256: 5b573d44a40f95a5ff2980a449d0337eef281313b88a277a5d0f864caea2917a
font_02_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1