Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bff13829f345ef…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 18:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 257aa7384cecc51650d642b8ef1c76de SHA-1: bc9cfc31ef9b1b92fbae5f0e946a5b5a8bfe3607 SHA-256: 16bff13829f345ef176b73b7dede7a6d060d79ecfb615fd3374e382906ec99db
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely to trick users into clicking links that lead to further malicious content or phishing pages. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5472

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.
  • 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
  • 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://archism.ru/uplcv?utm_term=download+movie+a+quiet+place PDF link annotation
    • http://tryinvest.eu/userfiles/files/natipumagotusavumoba.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/62105157672.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210916232313.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/87626888494.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/nijaganir.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77938207052.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/doxanopo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/81800683933.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/34005959489.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/pebepatiwazidewun.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/42354890866.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/33936863954.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/resejavejis.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/1144133272.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bbb04437---tikekidajinogasij.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/55704075487.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e580d5345---34743211074.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/14236024124.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/xates.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sevilikodozisojuju.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/fesopupobas.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/41415258932.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 10808 bytes
SHA-256: 9ed8e2e7e32a5d78889b1821d80598bfeaee8d1f438c3f8f1db9380585706426
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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