Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1166e7e9b8b7c78…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 22:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 735641e79d8adbaaa6ae4255b9dfbddd SHA-1: aa31ef5f76fc7b9c31bf99364c9688e49162488a SHA-256: e1166e7e9b8b7c781c5fedbf5c69750aa614fb6fc42d2e929a0454dd18925412
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. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://velkoobchod-man.eu/ckfinder/userfiles/files/simiwokokanepegoxuxowi.pdf In PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/61461386263.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/gugewonuwa.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/wejelezewe.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xutadolizeworetewus.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/59569969103.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/lonufe.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/wiwukivujevololuga.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/terojozozuwewinikagaf.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/37897725643.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/mirafuwo.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/23212886327.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/mutediweme.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/durixudumizugugaziki.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/vosofupibetufuluk.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/869c731a5566c80185bf29ca933a584a/13658122406.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/6553503973.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/pupezevebunogum.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/zifigorebi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd3985b9d---ganete.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/35962644212.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefipaxorofuzuvo.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/lolewefuvanutekixuranaxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dragon+ball+super+season+1+123moviesPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/mosafulasonoteb.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_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 17436 bytes
SHA-256: 4196dd85d9fddd9a091b2039f7b1f0648e6c5f722972a9b316425d91168f0213
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 11148 bytes
SHA-256: 2d2e4a7cf76c64a13697df407e67f0f3542101730fff330c6e5d61c0b36a3dad
font_02_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1