Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d8fc04be85e44e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 10:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1884184abe97b3457e8d1eab2542181b SHA-1: 0ee0f93550a614b355d391f8b6fc67ca22d80577 SHA-256: c9d8fc04be85e44e4ce64245273ab93e009950a8a3216a78d50f606c3e85e852
174 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript, which is a common vector for malicious activity. The 'Browser extension / update installation lure' heuristic indicates the document's content is designed to trick users into installing potentially harmful software. The embedded JavaScript likely facilitates this by downloading and executing a second-stage payload or redirecting the user to a malicious site. Multiple unknown URLs were extracted, suggesting potential C2 communication or payload hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://autopsrus.com/ckfinder/userfiles/files/72747741584.pdf In PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/tinonuva.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/vulenumotewizegelezikufag.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vefevelora.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/68329460538.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109080425576662.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/vexapufajuw.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/16894565480.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/manogifufanuboladotawal.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b7f722be4a630a526f64f0307b43de08/fuzokinisebabumofot.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/sagidexuj.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/nerunopigilaxutifugoge.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/56600878305.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/87179563948.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/jebakusugunukemuposovufup.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140703ae59be---2989062578.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109060744552534.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/nuvavosozevapofoxemu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/fufivelusumawuju.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/26826719952.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/42505054704.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/gorutaz.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/pinexegapoxe.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/xerid.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/4181317220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fmovies+downloader+freePDF 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_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 10548 bytes
SHA-256: da2f24c2aa879972870445966b1e9b56994400f4683b6740c312cbdb17228b2c
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 17828 bytes
SHA-256: 76d390de0067c795b3c1a698dd5e33dac6075af617ff169a9ac01bc44c7ef4ea