Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b1dfbd07736fb0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-20 08:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc1a30d76cf8819d778424af7faf7c14 SHA-1: 8ca958787191d7b1add86b2668a2d3babb751901 SHA-256: 26b1dfbd07736fb08f1fb29a6a1eff34ed5b84d0d102f67bc7dcd4046e49cef5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which appear to be part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous small PDFs linking to different domains, likely to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ketchas.ru/uplcv?utm_term=good+luck+full+movie+2014 PDF link annotation
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/maruzevo.pdfIn PDF document text
    • http://serting.eu/userfiles/files/64322038728.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/vitefuraki.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/5190477609.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/13072500096.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/sotorez.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/kigiwedim.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/50271868835.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/gasovifizekajaxe.pdfIn PDF document text
    • http://esistore.com/userfiles/file/27884615897.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/2742663161.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/31105405624.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/55349979132.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/bekum.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/73918772816.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/naxonugogofumoxerisifuner.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/20991923379.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/30963159371.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210919_191219.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v9m8535sgv1okonmoimltov5vd/60160800465.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/33573498030.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/58459721754.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_E4CD730BAA9FA82A.pdfIn PDF document text
    • 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_off0000b142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 16104 bytes
SHA-256: c0c0fa848faa3d501f006458cc4faf6def0b9f2a79b93686e3ad09e0e5a4d486
font_01_sfnt_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 10676 bytes
SHA-256: a1fac74b7b66cf1fb4434f67f8045de115b9e4348ee66b2ed7bc2e2abb056242
font_02_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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