Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5d7a76cc5a6aae…

MALICIOUS

PDF

94.7 KB Created: 2021-09-12 05:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9ed81fa89fd9797003eb3f687bf031b SHA-1: 48d4ffb2acc9368b9d731f09a82103f4a41a4919 SHA-256: ed5d7a76cc5a6aaedbcdeea24062770934fa8c0642b32a219162d10bb5330dfc
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 phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://webvitamin.vn/app/webroot/uploads/files/tobitisukikas.pdf In PDF document text
    • http://lnv-cnc.gr/userfiles/file/19833235719.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/sivesogol.pdfIn PDF document text
    • https://topupdana.com/contents/files/ribotixox.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/ginefavejin.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/64389845141.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135cecfc9b81---vamerizavimifiji.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/dotosalelaxadovokaf.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/32602918951.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/biwetazirefilorovif.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210911195848113.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/xulakogomawafojexezikinam.pdfIn PDF document text
    • https://mangallagn.com/images/file/95216666017.pdfIn PDF document text
    • https://papiratisk.cz/soubory/79797405138.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lazekufasovezenusefonene.pdfIn PDF document text
    • http://superazs.ru/images/news/file/beligow.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/49617773202.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xedagodonuzajoratowo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/60023891356.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/68606845564.pdfIn PDF document text
    • https://orrizon.ru/images/file/vekerigopexu.pdfIn PDF document text
    • https://t2sc.me/userfiles/64281755856.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/fawexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=get+onlyfans+without+payingPDF 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_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 10876 bytes
SHA-256: c2d401f05e86d269c95f50b57e6e5003695936f188287d1f5cca7efdad065c6b
font_02_sfnt_off00013eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 18004 bytes
SHA-256: a01142a87acf40be5a8bcbf29df43cc95343e97ba5ff6f2ac987bc4091a6d871

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