Malicious PDF — malware analysis report

Static analysis result for SHA-256 228966ff990c9922…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 08:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07c7ab43402f4889f6ecc382d1937bc5 SHA-1: 87868a3daac8a022ed6128bebc710f810c808688 SHA-256: 228966ff990c99222539fa9d7c05afa32cd611b66094054bfce105fb1da55ea5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript and external links points to an attack pattern involving user redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://toyotaautobody.com/ckfinder/userfiles/files/95980184978.pdf In PDF document text
    • https://lescourailleurs.com/upload/editor/file/gadazawotijota.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210916210231.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/44925841810.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63b0b39c8---24434483137.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/ruwifuputizadikapexesimaw.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/94441535214.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/98286496124.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wikevasag.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/pubavetejufo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/23709963198.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/joker.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24487242596.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/runanatisosijuvu.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/22410232363.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/sujipajekotare.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/duxujise.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c633f4d3ac024d34ddf27b5c1c46faca/81607003764.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/pepekisezaxudanobim.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/48238672996.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/79822953025.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zubes.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/mevijirukavezuvebe.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/6974775523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=precipitation+type+todayPDF 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_off0000b2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 10408 bytes
SHA-256: 472e6c41d08ad2c538fd4c64aaf4994dd237aa840b30b9616ac4afe633e3a949
font_02_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 17516 bytes
SHA-256: 096488e3cfcf28e2a5a0054e0652b695e15e68fe5b6038edad8e31d62568810e