Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bcff6f0c2f7013…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 07:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 415c9a66ced65f2e8e34b8e4fcdeb81b SHA-1: 63581437947c37d4142dc8408655a261bddeea91 SHA-256: 58bcff6f0c2f701302e3ba9d4783af9edbd9353d4add0ceb3573d142c56eb499
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to redirect users, likely to phishing sites or malware downloads. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alsace.annuaire-regional.com/ckfinder/userfiles/files/77050225687.pdf In PDF document text
    • http://wgadget.com/file_media/file_image/file/35506679804.pdfIn PDF document text
    • http://tayles.com/uploaded/xudizuripefanesariravisa.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/pawisijazikonuwa.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/29912553116.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/fazaruw.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/59225634452.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/jasasoboxigotamuz.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kokefejegeza.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/seridobevodefipo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210911115918.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206a7798d---duzodirilodisujugunesewuw.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/fozeka.pdfIn PDF document text
    • http://mosjob.ru/images/file/29638444301.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/mumidus.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/09e30122458d7952b2c1f29b6a644093/zosekokutaxonolagog.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/56082433889.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/81064967228.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/xigufuzipen.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/63295275318.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/xosakapalefugegexakobu.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/74100575785.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/8522720682.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/rivoworiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=app+agenda+gratis+per+androidPDF 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_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 10504 bytes
SHA-256: 0671700ea250198af7088fd85f1e22cc1dfc713d109a0beb62ca32e613e9f0de