Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ea06a9db7d0456…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 01:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76e20347ca5fdfad32359a7fbe5d6f1d SHA-1: 5c9b9c0491ebaaaa7ef708df99d096b1a3cf6cc2 SHA-256: 92ea06a9db7d04566bbff02519ad7bf42fe5f712a1132d41078dbff045115496
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to external domains, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cgpreceptor.com/ckfinder/userfiles/files/91049656854.pdf In PDF document text
    • https://dienhoanghean.com/upload/ck/files/lafawubikip.pdfIn PDF document text
    • https://aspirans.com/files/file/48849912021.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/76702379777.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/lisasuwaxidosotona.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cb15aaa4d999853d22aa02771894d89d/23866808538.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/32927329396.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/53982791433.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/bodigarategurukubosimaxa.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/79362538216.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/sikakuvasemudububidun.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/bejitawakerisuvuma.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161341490a0b11---gabetubejudapuxuzopulu.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/kuvipatipululegukejel.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81096755789.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/pebiragutaxogurarowugepa.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/dumewukezebopogesugenovu.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bafebumesamas.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450542e1934---30844244458.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/7796273922.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/rekijimuvogibipubopavo.pdfIn PDF document text
    • http://potya.com/66523871693.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/popijanufavewadifug.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/bepolat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ear+training+app+androidPDF 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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 17600 bytes
SHA-256: e901a6db1f0489e6cee220f38a90d6e53e10e65a046d6d85a6ca5e81713d4b04
font_01_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 10204 bytes
SHA-256: d15e38e406ac2b5955fd7af8aadee9300b71d9a92745e61f6cb45cfd7856f9e1