Malicious PDF — malware analysis report

Static analysis result for SHA-256 23523c3750a2da85…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 06:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62030771fd748c27de458538a0f68ed5 SHA-1: e4c206e7beabfee1389a0e918edcd5175bc68218 SHA-256: 23523c3750a2da854e8369e97724d96f1aec8d11fbb72a633b8ef116289a28e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or phish for credentials. The presence of embedded JavaScript points to its use in executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131497e93985---66837220105.pdf In PDF document text
    • https://suruburi.net/mm/file/72512693796.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/15798369822.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/sapogazumosa.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/nibezep.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/63113465476.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/kuvesimuwelodonebusojite.pdfIn PDF document text
    • https://norservis.info/files/files/63302515582.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/defenilizaroguzagaxigar.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/19023714716.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/18963570802.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vesotalapolumowok.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/60472491639.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sipedaname.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/xafure.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/8687194742.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59567636329.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/xasizami.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/2868981202.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/82236217713.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/wozositigokanu.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/muvasurisiwutixumanid.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133290427ecd---66004873327.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/babopovakaper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=camscanner+apk+new+versionPDF 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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 17596 bytes
SHA-256: 519eb6151150e0e09036bd8a7f4af9656886a9f35b20ad4039398684e6c2a126
font_01_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 10668 bytes
SHA-256: e6b52a249c78baa4ea1b485806bce3d81ef5d2fca770acca79715074bb6c7196
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1