Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed394dfd5d710f0a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 02:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a14dd2b5c8a9701709e3e1e35ecf279a SHA-1: b7c68d80bf10e5c6f3361545b7ce25341d592de4 SHA-256: ed394dfd5d710f0ac2b7ec303b779b64521d1064eda8bd9711c3d9316cd01e35
166 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or update. While no scripts were explicitly extracted, the presence of numerous external URLs, some pointing to potentially disposable hosting, supports the phishing and malware distribution intent. The document's structure and embedded URLs are consistent with a phishing campaign aiming to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://pistant.ru/uplcv?utm_term=xiaomi+mi+box+s+factory+reset PDF link annotation
    • https://tekstilkentrehber.com/upload/ckfinder/files/74016499710.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wasabokiw.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130636b49439---24308654197.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/relekowusogalubi.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/62729171283.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/42845141071.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/zabomadeku.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/32747342476.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/65442573650.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/18740597954.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/dejifabarosa.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/paloro.pdfIn PDF document text
    • http://taociren.com/upload/file/210905183245228251x9wxr3s5ig0v.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/viwadiwaperesetoli.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/fukerenukor.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/wofasenogovap.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/notebojobadonefufosafu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/35825262539.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/71856393592.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/64743963150.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p7u6s598h2j3psf6i8au6rs57/guredijagugaret.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/mukadunav.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/93038520447.pdfIn PDF document text
    • http://taociren.com/upload/file/210902031228308877fz7hmucknhvo.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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 10712 bytes
SHA-256: ac0229a9e84e3f153fb72d0d09f5847f06090b40605bcc538a85e3e46732a2b9
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 18376 bytes
SHA-256: 049d0d729fadd27c42d9e95a701416cbda18e44bace54256d71ae7aacdaed918