Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebe9201ff676431…

MALICIOUS

PDF

87.2 KB Created: 2021-09-19 12:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3904904723271190a9cb04d64534a8c2 SHA-1: 473808db22b6b2cc8cba98dd2dff06259047ec87 SHA-256: 6ebe9201ff676431954cddb6fcfaace9efc74a33ebc7f239686c69e9fce49360
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic indicating a link farm on disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or phishing. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kbfrutos.sk/images/_file/jiwopixosutozorinan.pdf In PDF document text
    • https://appvid.eus/userfiles/files/1207353318.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161305bdef02cf---39735890474.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/tixelutinaganejuliwuvim.pdfIn PDF document text
    • http://trieuduong.com/images/Download/36888843113.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/21877964390.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210904_224522_8339.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/jovina.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7bf1cd9a---3376766951.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/guzidunolomumex.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/30248178063.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/7447665154.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/1470914407.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/xovivebujifigus.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/mukute.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/luginozepesurewikirimafol.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/48026979306.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/lipudunijuxiketubavi.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/88921937299.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/45971133827.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/kowurinadime.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/68897567945.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/207039893461317e91611dc.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/55369454797.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/70068805086.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07efbf5e0---fuxofarenifenomitet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+game+ppsspp+smackdownPDF 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_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 10748 bytes
SHA-256: 4dc81dbb9367b44eeecd15dab41bc041fde92327fb1ff973de92d9b31a53fc1a
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 18148 bytes
SHA-256: 454412f60f38f44f2d3d09de112cae6cf5fb45aa22bef2b213529f26b2d93e9f