Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda5e01946593de9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 06:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbecc88a2b4b9175f4d726493c1157f0 SHA-1: 59b5f9295d39fb237d37c5e5812289df6aab0104 SHA-256: cda5e01946593de945b26c195d8bd472fd5093f4163422f1799c8714794133cb
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The PDF's structure and the presence of JavaScript suggest it is used to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://takarasushimn.com/userfiles/files/18922646662.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/59292801772.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/bekaxiwefupoxufosijaxo.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/13139281399.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/29158515690.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/dabaxo.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/39605722154.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/sumeromolulaxirexobexije.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kitakoxelo.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/81492517073.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xifopitawawu.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/75270663329.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/13562480395.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/12884205065.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/fivonij.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/bedupaka.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/saxatosabejagexuwuzap.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/50646796917.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tivajoboguxuwud.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/jotelepu.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/didize.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/37713241857.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/959b25b30505c9ed5841c7dd1bfc6cb8/95785088509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=project+free+tv+svuPDF 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_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 15556 bytes
SHA-256: 5449e773365e49bbbb8fcaca8ceb53945380e2343635f60640b210cf68311794
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10220 bytes
SHA-256: e020de67b46d7c12222d183a039f8a788e4b22a0631b7dc7af39f9097c8728ee

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