Malicious PDF — malware analysis report

Static analysis result for SHA-256 44568c8f569fc9df…

MALICIOUS

PDF

83.2 KB Created: 2021-10-31 05:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 1e7802636d9dbdb411b78d9bcaea4693 SHA-1: da91639f0e7f3d4fd87029fd0ac8ec4e812c612e SHA-256: 44568c8f569fc9dff38d1e0df18ebeaa1049c03185ac546ce8aaffbd63987c29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings like 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://khangvietdn.com/uploads/file/zupenanefisizetefira.pdf In PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/sovuxejuvokimitur.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/wixevogazuw.pdfIn PDF document text
    • https://mahae.hu/files/files/49782200907.pdfIn PDF document text
    • http://huefpdf.org/upload/file/zezivudaji.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/40217423274.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/18048807060.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/sutafobawivewevifev.pdfIn PDF document text
    • http://marine-inox.com/i/File/riwuvikawirug.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/zirokededuzibajotasub.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/solupe.pdfIn PDF document text
    • http://master-br.ru/img/file/75715242981.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/812579974.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/kologumiwipusuxaxepe.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/66720772873.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/84384456396.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/tulemozobovulosaw.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/newufej.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/56594149795.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/90197768279.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0263c9bd8---rituwonuj.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/31461797225.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/bebevovepidu.pdfIn PDF document text
    • https://migger.dk/userimages/file/56561180592.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/73890857356.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=valium+for+tooth+painPDF 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 17808 bytes
SHA-256: 16558b36ebb8ec9044ec6f0a227af4023b37059441fe9c06aaa01f3b175a3647
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 10392 bytes
SHA-256: 2fad449cdcdcc9995e835d786e1f7c1995bcaafcb65ef9c1af57919c88356592
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1