Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf16a181259df710…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 17:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23b1645667e6528a8b70e98f745eeff8 SHA-1: 5ce5db97dd6f413e39725b1ce3d2d42421745ec7 SHA-256: cf16a181259df7107bba6ac006a2c5666bc481950306ec30450d02952ebb0dab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. It also features a high number of external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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 http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210908_71FD04D9A7F36D54.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb61031f0---lozinibovizobal.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/95588299484.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/sufoxev.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1608757666144f0a5aace6.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///12784225963.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/23556979511.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/siwakamijanaxutofuvik.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/42444728394.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/madunemivonazubef.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/gobuk.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613258c6cccb7---guxilatufigodikoradotupin.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/nigake.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/mawig.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/23569684518.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210913132211742.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxas.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091306002624.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/davifetun.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/jiluximozokixeg.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/kelejojegowelal.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/kewikalabopubuxiwufopor.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/33986803484.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/54960859750.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/kagaxuxavisevulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+firestick+app+for+sportsPDF 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_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 16928 bytes
SHA-256: 876e03292f6cf33099b6175b32c323501f9dcaaa73d2f77638ce091246e61f80
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 10468 bytes
SHA-256: 2481e3f232c28c77c8e54607a6ccd0f21f7a826b9c6ae569fe06e3f2ee5393fb
font_02_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1