Malicious PDF — malware analysis report

Static analysis result for SHA-256 81494f419b0313ea…

MALICIOUS

PDF

85.8 KB Created: 2021-10-24 14:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5e5995a6c85f5f510d1d0e0e97e2a3f SHA-1: a456b828bebbb292578b177680466fd85175ea0a SHA-256: 81494f419b0313ea237a24402ae88cc6db35a500c0f7490361e3f48b2eb6d9a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this is a phishing or malicious content distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ccswcd.com/userfiles/file/31436462262.pdf In PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/37583162115.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/mt538sdo23l2mmidbk090b5gh7/rusitaduradut.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/fokevosevok.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/13721376356.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156be910652e---sotefokajenidunukivib.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/bukugunanimigubeji.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/wevikiza.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/41818987555.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/gozarudajozutis.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/gerepelu.pdfIn PDF document text
    • http://househouse.it/userfiles/files/tilugi.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/lumafigajugetosuzizuvonow.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/daguxuma.pdfIn PDF document text
    • http://ocung.net/img/files/lizuremul.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/9108026392.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/weruwajipabimitozuma.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/xuresomavetakebuv.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/4060395489.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/69313938070.pdfIn PDF document text
    • http://jcsh.bluezp.com/ckfinder/userfiles/files/bigulunofitakigelos.pdfIn PDF document text
    • http://didopack.com/files/petekunawirad.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/pefikupazijotale.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=how+to+disappear+novelPDF 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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10528 bytes
SHA-256: ee4caf03a337a49e15d31dbe9a2bea862b3fb209facbfbfbb2168397d9050665
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 19752 bytes
SHA-256: 314048fe2dcc2e68386a884c222498432c17d641a7bc62bbacec4241ba5f3786
font_02_sfnt_off000131f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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