Malicious PDF — malware analysis report

Static analysis result for SHA-256 9337e57d63c63579…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 04:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c74141c4385ae405aec3b217b2cb73b7 SHA-1: adb76420c96ca07838e5466b5dbd7406ad947a1b SHA-256: 9337e57d63c63579b8957ec9a077803dc1bd55a2cefe1a1441f091025ff52e55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to other PDF files hosted on potentially disposable domains, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, likely contains lures to encourage interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jeansresource.com/js/ckfinder/userfiles/files/2438089833.pdf In PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/rinopomurerenoval.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/19667639526.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/88927688790.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86789813d---91685684703.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jadav.pdfIn PDF document text
    • http://seamacros.com/upload/file/wunelajinebudawemuxof.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/897c3901bf9f39dfe7fd2f3d947319ae/83157115892.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/77347648610.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/56892811293.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/81265157568.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/ponenipeta.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xogakaxametebe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pizaxopirivilefawepima.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/zupubidoxesagafopumumunab.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/geloreroxafezafa.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/bopigovarejepisijikasabik.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/59059450466.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/241801_reregikiruka.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/48314090895.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/50960623129.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/94493193144.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/53136075223.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/8193769490.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/lujupelatoteselikigu.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210914031850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=scan+qr+from+picturePDF 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_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 10748 bytes
SHA-256: 9ca6615aa0e52791eb8dd2ac7505a96b6c36df1070aab9dd9c7bf45e3b30dd51
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 17488 bytes
SHA-256: 0f9e8e3a5f72e0b7cc74569e123e15af3f0d50c19cfa267788a4ec26cca3b9f2