Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0eda37118ee1aa…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 14:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ae420f2f18e933e82a50a1f5422c4cd SHA-1: a17f49d842daed9f7b7fba934f5c21e585e0ada2 SHA-256: 4d0eda37118ee1aa08cbea1bcc4b711cfdb1260ad0a517efeb8961a04784a13c
134 Risk Score

Malware Insights

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

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 ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://uat2.hkha.com.hk/ckfinder/userfiles/files/wavuwatukuru.pdf In PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/totipomufaregizixomijupa.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_024715.pdfIn PDF document text
    • http://777mto.info/contents/files/28193431272.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/relok.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/70245194099.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/29072979845.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/20359705223.pdfIn PDF document text
    • http://pnalog.ru/images/file/morujetux.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/51596251325.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/19886050118.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/7257708907.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/4938028143.pdfIn PDF document text
    • http://cortabellanews.com/userimages/roworox.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7f2652bfd88c8eee26550560edbdd86b/46022699813.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/jenomijalofojilek.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dinudujiledejonoviso.pdfIn PDF document text
    • http://newshop.jp/archive/file/xadaz.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/mumisivakorojorosirobez.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/42748874503.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/rizakapa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xivaxisusipe.pdfIn PDF document text
    • http://sartor.ru/upload/files/48862228867.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/584132040.pdfIn PDF document text
    • http://talesma.com/E/file/timimiwuzasobiz.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/57827790970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sonnet+18+meaningPDF 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_off0000b3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D7 14912 bytes
SHA-256: 1f84afca9c22d2e9e7a3ea3dffa7dbd201ee95b57ff31fbb6e18faff75e97deb
font_01_sfnt_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 10472 bytes
SHA-256: 91a6751a062dfd182596628e051c18984a3d0724da6afc50d604a5a313492538
font_02_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1