Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7f40904373ff04…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 23:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c0f482e771a620f9f1df8b2616e8998 SHA-1: 63b901fcb531bb8640cb3e9d3af7d14c3cd7c849 SHA-256: 9d7f40904373ff041f9f63696249b57e082e59c380a868fa232e3d1e728c2a91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and acting as a link farm, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious documents designed to redirect users to compromised sites.

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=outrage+coda+full+movie+free PDF link annotation
    • https://net-mex.hu/ckfinder/userfiles/files/digofutonunoziwagesujori.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/zixesew.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/3987428805.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/26455844062.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/24180714295.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/tokulujubugenufusapab.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/53608579896.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/piluratetegunaduleze.pdfIn PDF document text
    • https://educhina.mn/editor/files/62710410199.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161328c8ad840e---62968830.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/vogebuwenetiwujubibikul.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/87141168026.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/xazilulakobaxam.pdfIn PDF document text
    • http://chpcentre.com/files/file/babugetefasiridasili.pdfIn PDF document text
    • http://afro-safari.com/upload/files/voruf.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/fadanujigalinemikasez.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/nevel.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jarirolijumazofufataj.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9656f171---6491584318.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/fozebiponifamufoxawom.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/87628225642.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/47578158747.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/rorepemowasos.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909012856.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/wasulovabejimalikal.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_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 10736 bytes
SHA-256: b6c0af27431b0c4109cafe621c670af85ad44b5606411a734151053dfab26b92
font_02_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 19604 bytes
SHA-256: bcaf183c221964c6c0ac2caf08c84563a81a4f6c6e83ca5eb674ca904cdb6ed9