Malicious PDF — malware analysis report

Static analysis result for SHA-256 87514d1ac9fa5ae9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 02:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8e5998579457cb47f895a762c5ae8ca SHA-1: e8c79523a07b498197c3dfb7c761944a535f112a SHA-256: 87514d1ac9fa5ae9a420261d343cdf78c9eadf0f0c3f38ee1d3f6837f17490bb
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it uses social engineering tactics, specifically a password-protected archive lure and a browser extension/update installation lure. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristics strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://inventory-acepipe.com/images/uploads/files/wotumitobur.pdf In PDF document text
    • http://targhevaticane.it/userfiles/files/88536248848.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/91518799440.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/83980937510.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/zukizatonuk.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/71072984414.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/lugiwexavebowes.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/tuxidudutumatemodir.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210915221149.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/53116753375.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/gawaduxaw.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368e62efa97---niditez.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/28853019925.pdfIn PDF document text
    • http://feg.vn/uploads/files/29998521809.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142354157d85---73676488013.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/zikuvefedonita.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/29642878266.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/33511333198.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/jimadogonunixivigu.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/21445497426.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/73931184901.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/jujukapigin.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/peluxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=stream+video+downloader+androidPDF 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_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 18684 bytes
SHA-256: 875533eaf651965174e1b5bd49abac15ef3a3efd7b434c27b2dd5c64e37dd625
font_01_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 10468 bytes
SHA-256: fea7285f22ebb6e190afc42a2c5be0bda2e34969bb5219b3052915b05dfdbabc