Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4076670846e490c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 09:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f70319f6e47e304384ccaa73fcf2ef0 SHA-1: db41c38c905960c9e23ccd02863895debf94bab7 SHA-256: e4076670846e490ccc873ca74d6b09445ec21f72259453f33c64c765b97bcce7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a4b8ef580---ribafugagoz.pdf In PDF document text
    • http://mariamozharova.ru/uploads/files/vuwomubunowozotewosaleve.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/56087290891.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ulozipoguvogedisag.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c770b816b2---97799282702.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/16929427240.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/retapaw.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/jajulugogomawejefe.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/2296404382.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/53813273607.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/jarujobejiwotawobaw.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/20519099.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/vaved.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/91273820862.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/guzaleduvesasovofuf.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/97780183205.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/pofesepebaxigozix.pdfIn PDF document text
    • http://pay2pay.net/upload/file/lagidebofewojoxuzifeguxo.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/jukepumobo.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kelokiwodowoverusa.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/wofudirateparekijebupew.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/24208434301.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/ruwejukemagame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+restart+your+iphone+without+the+power+buttonPDF 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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 17896 bytes
SHA-256: 183420342ec41b7c48d3957b6295bde63435c23edb45cd4c5de23ba2651b1f5b
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 10732 bytes
SHA-256: 7c473bae6b9cff0d8d0278482ecbeca0c9d89fdf0dd99519bb3b54c69fe4fcca