Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa79c199f8470c9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 21:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae36bb68d3c65321167c347b7f06625f SHA-1: 85890a309fcaef116f57ff72402b43f9f66158ba SHA-256: daa79c199f8470c9bd1334dc06d268f1af0b913997c9797f790eb59d1b8bc255
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for malware installation or credential theft. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs and the nature of the lure suggest the document is designed to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://aradovan.com/userfiles/file/jawusedemaroxonibibivimu.pdf In PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/didajigozoba.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/48815406813.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nirudiwif.pdfIn PDF document text
    • http://airfa.it/userfiles/file/72416879583.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/rotavisimopuxi.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/lekavokapipa.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/68032844054.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/66738757251.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16147611d79a19---mebotutoxo.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/81137766928.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/25773600116.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/musewavamajisubuxabe.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/gisukemaloliduvuv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd1eb76ad---71114898951.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bizumutagepulonu.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/6443900985.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/jitoxexinomifikorejom.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/rulusazipavi.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/waropowedirolonuduvojikad.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/43033961215.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/97615772355.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/62354898641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hack+roblox+aimbotPDF 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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 18080 bytes
SHA-256: 7e9fac74a701c812f5c622c2c67aff701d12a818b47e0eaf02bf91bf67b06be0
font_01_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 10312 bytes
SHA-256: 7f2bf8435e210cdd4e488b49d23f9cbb61ad21ffb4337c0120f166c8999495d4
font_02_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1