Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d93e8f6cec8d8e4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 13:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a94360a9be0ec5eee0750295404bf849 SHA-1: c8df3094b995f2cbb4574423731f6f1884b70f5c SHA-256: 4d93e8f6cec8d8e4b69243f1451d1b486a571c199b6698224175e7c73304dac7
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious browser components. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dongciao.com/uploads/files/202109110053133101.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142049d79cd6---sobenowutipigubikakigi.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/5617045531.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/nejubisatesan.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/keraxewumabuvoximoz.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/begefuvunisosolav.pdfIn PDF document text
    • https://e-midas.ro/files/file/detefazosilotemi.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/66783005484.pdfIn PDF document text
    • https://promise-land.com/upload/file/39969439129.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d898a1ea1---79594607806.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/papedototewebamuxevu.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/61155608276.pdfIn PDF document text
    • https://tarsiman.ee/files/file/wudoniwutidebolizitenewo.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/79161938300.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zanivo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nimowitejesigejutojinal.pdfIn PDF document text
    • https://gdaniec.com/upload/files/natasupujebiwowumu.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/41050780720.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/94092845110.pdfIn PDF document text
    • https://pokereshop.cz/data/file/topuketolipun.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/97068055233.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/79172907287.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69751673843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=psiphon+pro+249PDF link annotation
    • https://lapdonline.org/file/merukerazid.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_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 10276 bytes
SHA-256: 0a169ecf41f272f6c4ccbe7efa0f5b8ed10a70e7b98f89fa02f4b04bd42ea19f
font_01_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 18412 bytes
SHA-256: 1d5c564b9065f68b0328cfc826edaaac6b48e8b5a07386374b5d1adc697ee6f4