Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd17f3db64dd091…

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 15:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cdfbb29d47dab17b306bf9c833f278f SHA-1: a4c2ff98a49971d5e859b01924967e1ae51a890f SHA-256: fdd17f3db64dd091dab4932d5acbce16967e4f4ba112101a04030f0e8e5edad3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. The primary attack pattern involves leveraging these links to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/57435454979.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9b1f0d67---64610501517.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/xujakawiluguwogup.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/welomoxoketujitirawe.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/rulurajaturerodamusubalop.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/51692963052.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/zenusijamugawifijojusug.pdfIn PDF document text
    • http://juncheng.tw/upload/files/21943235648.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/rerifosabufilereguza.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/33288346466.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/susizanijivabegemox.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613858ea3a347---89662985398.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/2767686938.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090814052271.pdfIn PDF document text
    • https://digireg.nz/upload/tomiwebup.pdfIn PDF document text
    • http://uco-kampen.com/media/files/60563971796.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/79409746510.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/lefizajabiwutipen.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/ruxomimavedonaredalirarun.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/lebogiweraf.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/87054320036.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/43281482858.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/15761391353.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/mijulugitome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ohm%27s+law+activity+sheetPDF 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_off0000b868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB868 10496 bytes
SHA-256: 2b35a9594907b0c1c2f626e59bcd96e1c86332eacb194008f0ea03d3f29f638a
font_01_sfnt_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 15840 bytes
SHA-256: 9d9e1f4f4c2c127080f54e890d8330c70bc672e88ce816c882f19590a2d47edb