Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bd5003b3cf8cd3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 13:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9621ce6fff1c82be91326b0ea6242485 SHA-1: 98459315cea73fcbe269d2959753b92773aa716b SHA-256: d1bd5003b3cf8cd35b80dc6fe67a090a444e68dc428d1409055e610c2abb8f02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://andreuma.madteam.net/ckfinder/userfiles/files/jovaxa.pdf In PDF document text
    • http://cecev.com/stockages/files/soluwofofiki.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/ruwuboteruna.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/vukumasufaboralubugilaza.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/11623219297.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/71643422964.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xizef.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/betibalisawi.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/61431742578.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jivosubumupofagakawisu.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sotujofuvo.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/giraxaxafimi.pdfIn PDF document text
    • https://alariel.be/userfiles/file/98004921277.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/89269117755.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/72868109688.pdfIn PDF document text
    • http://balone.net/_upload/file///81122588625.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/58088919383.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/dijafuzajutodiwusuzop.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/kukotizumejumaxu.pdfIn PDF document text
    • http://szpk.hu/_user/file/vuxovudutapoxiwimi.pdfIn PDF document text
    • https://wmu24.ru/media/file/zoxoxafometuluwatemufu.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/24029250258.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d0299c8d---10551520485.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/wadol.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nijazatuziwugunivinagujo.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/73455720532.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/71797024589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hogwarts+a+history+pdf+downloadPDF 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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 10836 bytes
SHA-256: 981cb1a6ab9c4bee4b8e478986a1f000d9eaa9b60574c7f7999740cdce533aff
font_01_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 17336 bytes
SHA-256: e1c0ee75080e42e7b9cc5086a5a20e5a5122aaeaf980ac11c63c5340d1edb5c2
font_02_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1