Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5c45d2d1f40657…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 04:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df0ee4fbd1c41f29b044a1b316952ec4 SHA-1: bb8538e2fe6d64ae8aa7b9088cffcb35d4cb0919 SHA-256: de5c45d2d1f4065786e6b7a6a84b6259635fb6ccde11dcd8f064c66a1749a303
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=adult+offline+games+for+android PDF link annotation
    • https://limadelimon.com/images/file/89553358064.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/basomowamumokil.pdfIn PDF document text
    • http://519pf.com/userfiles/files/51147789224.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/55139184798.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/92083349402.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/42615464030.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc41e0e5d6---33387474727.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/farukirabo.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/23641344232.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/44600012165.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/zikodumixujawemudesudaf.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090504480383.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/mumaxidijoz.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/tapirogekusugekegaxot.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/81590144584.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/pakewasunabi.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/xezebategonosuferideva.pdfIn PDF document text
    • http://ping-property.com/user_img/files/gikozix.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tujajivadovixabofumaj.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/vigobamesavefarewet.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/33668bc868e0302fb8ce5fde3ebb2164/49441826895.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/wutapogebujageb.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/21799158153.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/38147229404.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/55762014233.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 10776 bytes
SHA-256: 057f8823f68f63f133cabc25fbd7cb425b9e6d44213326c3d9cc32b0a4153113
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 16752 bytes
SHA-256: 9b33f1d4395a504e0870254faafa0481ce134f001dd8aaa736ed64a904ea0479
font_02_sfnt_off000130ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1