Malicious PDF — malware analysis report

Static analysis result for SHA-256 22410c62dba954a8…

MALICIOUS

PDF

88.4 KB Created: 2021-09-20 23:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a028da050421ac70b729bad58270a202 SHA-1: d9abdbf071420c0689af453c4ad72a10ab23127f SHA-256: 22410c62dba954a8ff47b2db2128c4ddb971bef1062236c747c7273e4ac8213e
166 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser components. Numerous external URLs were found, suggesting a potential distribution or command-and-control infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=doom+unblocked+games PDF link annotation
    • http://gibisch.info/files/files/pakalukogejivazedanomig.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/fikerujaxusaduxepesapojo.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/32843579615.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/sawapafavog.pdfIn PDF document text
    • http://hiniceshine.com/upload/fewetajadamezuzuvili.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/jojipasiborugarozavukugol.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/76632497507.pdfIn PDF document text
    • http://contua.org/userfiles/file/83005516415.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/dekafide.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/werezujujavinusepisegirum.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/79865108070.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/xusujusuv.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/3560177781.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/14643383860.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/zidozogijeboxekiwip.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/xifamaleniso.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/ralof.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/jizopobutevigadatodij.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/jomozufimimeb.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/28745123900.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/sulutemibokasuf.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec999478e2---vuzivukemusoseduji.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/28765435487.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_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 10756 bytes
SHA-256: 218b434670a6bb34ec17c9a4123e4e8816480ee1388a42c82f5ce3392069a383
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 18540 bytes
SHA-256: 72975f32bfd021f405091ec4b3d213cba91555039b8959fe4967c68bc7137d71
font_02_sfnt_off00013be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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