Malicious PDF — malware analysis report

Static analysis result for SHA-256 706611a4d1131dd6…

MALICIOUS

PDF

70.7 KB Created: 2021-10-07 05:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8a8585e2501e3c2b59182f6ac0b7e3ea SHA-1: 631ebc6eb8ceb7e2cee5e25c333cad3d116be454 SHA-256: 706611a4d1131dd643232c0e72efd3a1cec8b9e9a80db6e12bb0be4f616d4fc2
102 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 distribute malicious content. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

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://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/56379821554.pdf In PDF document text
    • http://yushendesign.com/images_fck/file/1631002922.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/sumeromolulaxirexobexije.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/68432263973.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/warajub.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615869eaaf7e1---65476555108.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/72a06fd3f47f7b0d540134217a7cd2a7/fagixazevorep.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/43527071102.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/womuvazimimesasi.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/40968070908.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/78210779489.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/xixenoripugugonofup.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/xefomalu.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/gilatepuburupobeboga.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0977534001632179874.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/31206787457.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/vokuvowuz.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/66089955290.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/vovaforadi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/85763744180.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/wujuv.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/82846377672.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/mebovezex.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/muxebakorujaza.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/telopadideda.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/midap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=shape+of+you+english+mp3+song+downloadPDF link annotation
    • 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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 11296 bytes
SHA-256: 194107fd519e7afe1d789cef0b0dea29394bfa9bd33e390b1f6b9e54359acedb

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