Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d16b435c968a4eb…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 06:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a3a7222efc071b578f84c3691f4e6fce SHA-1: 45cfc91d2ca0c60842bcfabc0cdcb4598266ca89 SHA-256: 8d16b435c968a4eb2515c989838c3d671054a1cf115f96e1a32fb91cab8e42cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through the linked sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://wastran.ru/uplcv?utm_term=notification+tones+android PDF link annotation
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/saxif.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161500841242fd---28872130219.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/datalimekobafoj.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vapiwe.pdfIn PDF document text
    • https://tessuno.com/upload/files/613976c1db713.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/86308944946.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/popizotopate.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/13017971758.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/91111495546.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/30376075275.pdfIn PDF document text
    • http://adveotec.com/img/file/44069014796.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/rivulexaxivugulimijewoma.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/vogulexaminojena.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/63596852097.pdfIn PDF document text
    • https://vgk.tw/upfile/files/2021/09/26/13146924156.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/vigijokofitekebejuxepiw.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/kufiludan.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/43923002666.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130b46a4dcd8---62732449903.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/lakirot.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/pogolotelofazonig.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/3794702628.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/jozozafukekime.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/lunijebevajoxo.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_off0000b23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23E 10400 bytes
SHA-256: e71cf127e1774604438c2e82121666820bcf7561dad78958cbb881ed2bef774d
font_01_sfnt_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 15156 bytes
SHA-256: f45720051e20d7c67493615de2cdcb14ad39dee6528de1e02e58ed4e2b12a2f8