Malicious PDF — malware analysis report

Static analysis result for SHA-256 05394655977398bd…

MALICIOUS

PDF

91.9 KB Created: 2021-09-18 10:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d76c03fb09a20146a21f7936b6122136 SHA-1: f729bf007f189368712050f373edd6309f176aae SHA-256: 05394655977398bd0440d73fb893d23a038f9c138cdd0e1302bcd61423c1ecaf
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a financial fraud or Business Email Compromise (BEC) attack. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/bevozakigewide.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614207f3cdccf---11039135157.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/pozupuvawewir.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/85220795464.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/85950118674.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/36990227832.pdfIn PDF document text
    • https://airxps.com/userfiles/files/dezikarevimukekebo.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/97767765126.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sunuj.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/garipiwomebefokupexozida.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/watuzedonesawogurarulinof.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/86989588982.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/1141511130.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/wisusazeto.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/morenim.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/pisirek.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4cc379eb---kekobizazisibunalopo.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/vemuvedisipemebijubet.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifopegekadiv.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/19969789509.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/19268889786133b18d45aef.pdfIn PDF document text
    • https://ikansambel.com/contents/files/12178515409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+steam+20+dollar+codePDF 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_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 18216 bytes
SHA-256: 5e41fba567fcfda619248e9b1c2e93dd363f836ce68888d5d443f485a1f20045
font_01_sfnt_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EA 10552 bytes
SHA-256: e97b198d9dc152cddb131b9da026118a34bcc367cbf7c19f5f0d3fb83b1cc2cf