Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b6ff97107d9fb0…

MALICIOUS

PDF

81.4 KB Created: 2021-10-10 20:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f563436c32247ca5d98d8c2f27315df SHA-1: 5cefadc00eb7ce2d68b1595e22b9d2f94c1f4182 SHA-256: 50b6ff97107d9fb0281f8ad4a838d46b570379181e5bce20ffde784faf950519
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mallorcaboom.com/res/wysiwyg/file/5260587388.pdf In PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xikujanejivalen.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/23440437135.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/poxikojozimopunukapuju.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/zugeg.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/jupaluxixatepe.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/vonejipitalevazufi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613775f772eda---bavedujin.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/87197536166.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/zisoloze.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/15701402193.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/wobepadupud.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16156004fab86d---gebokeligojisetenijekada.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/8485833215.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/67646606070.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/28654645446.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pekasewora.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/jelipekakedo.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/69577837215.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/vigewesoxabisinaj.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///gejunujunux.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/wigaxenef.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/87342864074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+landforms+that+are+most+heavily+populated+arePDF 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 11008 bytes
SHA-256: 8fc3d6742b6e05fb7d15c68d80eeaa247863db3c6709594d4e1ae58a3b01b523
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 19692 bytes
SHA-256: 50f7bccc165ec47b059f0e2e910f5464060eef2f8b5504b0a637a51ed9206dca
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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