Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a75a4f8d496287f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 22:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0652261e042ee34356b4f10d4ae603cc SHA-1: 0e9e9cc41468377b6007642400d280ed6e11dd3c SHA-256: 1a75a4f8d496287f4559fd13361a3c28e2b4cf7189b855837cdf87368e36064a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a likely attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ambvetsanprospero.eu/userfiles/files/26275875443.pdf In PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/74828463979.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/26567399622.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/22623715515.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/rewumatofalanapob.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/kesimaku.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/33810864073.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/15657648635.pdfIn PDF document text
    • http://opsir.eu/files/file/56582825060.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/60297267131.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/55429699982.pdfIn PDF document text
    • http://topas.lt/userfiles/file/xafudapaxawefafefusut.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/guduwejaxavexizevolipafoj.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vokijupasopejude.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/59024101234.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/64414994827.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/dobijagomogegog.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/lesewobejevadi.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/63396868475.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613529236cb6d---88471653360.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/vamaluraku.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/5280008513.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/ximojobolufelira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=duck+life+3+cool+mathPDF 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_off0000c5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 10596 bytes
SHA-256: 376f7759950b724a04c4e86d9a7e66b4708a6d69e92ecf6c9f8429cb2b793026
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 17680 bytes
SHA-256: 88fb31942b69ff3fc5883a4794bb50d43518f0a5a9e4e0469edd8179e32c3b9d

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