Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8d15053b9eabfb…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 12:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78b41edb6add93a043f76189a0dfd714 SHA-1: 8d78514878277b2623697acaf2f806ff739b67cb SHA-256: ae8d15053b9eabfb60d3caa1808bf1fd7bfe6a8d2b21e45b182027c93b0eccdf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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 https://archism.ru/uplcv?utm_term=official+geometry+dash+demon+list PDF link annotation
    • https://moveo-sport.pl/userfiles/file/70896871286.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/dixanuzobatame.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/sufoposuximedidapezonuvu.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/vurozeta.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109121532069465.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/60603494540.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210918_132039.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/momonax.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/nawasepelit.pdfIn PDF document text
    • http://ktcz.eu/files/files/8893007523.pdfIn PDF document text
    • http://www.520amis.com/upload/files/16186489457.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117c6c52c2---21036144718.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31212181760.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/85ea8f1a88cbb68e4de94cfdb27748b2/90051366937.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/42715160094.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/62727883805.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/gedemikikutapizew.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vopejimorabixevopivo.pdfIn PDF document text
    • http://contua.org/userfiles/file/fevut.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/fuvavulepojizijotexuwi.pdfIn PDF document text
    • http://bdn10.cz/files/file/65009904529.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/mizajamuliloderamusex.pdfIn PDF document text
    • 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_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 17672 bytes
SHA-256: 0d4c5ddae72e4f9ad968a614edd3fdb36b5cf57efdeaf0f60b7d5cd31eec0556
font_01_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 11060 bytes
SHA-256: 1ddb6751a69fa49a0d2f899fd9b91317d24d729ffe6ef484547666bc6fead6b8
font_02_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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