Malicious PDF — malware analysis report

Static analysis result for SHA-256 816027e4c39eae2a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-21 02:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f4d13ed4ce6a4ee3b775a2c72c33d6c SHA-1: 0c5a5a0aa193ac1b43904a5bdab167aae7cd7055 SHA-256: 816027e4c39eae2a7f4a95e53e0c37d778081c2a171a0f72a34685bcce98b415
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms, and one specifically mentions 'free robux city' in its query parameters, indicating a social engineering lure. The PDF structure and embedded content suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elard-group.com/ckfinder/userfiles/files/40061372662.pdf
    • http://cupta.org/userfiles/files/20210909051439.pdf
    • http://auksozvynas.lt/userfiles/file/93901081704.pdf
    • http://taispacedesign.com/upload/files/mobidudisisijuked.pdf
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/risosusovaludoduwi.pdf
    • http://architettosbaffo.com/userfiles/files/jadamug.pdf
    • http://pospatrans.cz/UserFiles/File/wefemilogi.pdf
    • http://poliinc.com/upload/files/21125876640.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/tivufatixufu.pdf
    • http://vnos.vn/app/webroot/uploads/files/dozixowet.pdf
    • https://leosservices.com/userfiles/file/bedusatajovuk.pdf
    • http://xhiehchin.com/Xhieh_News/_file/zodado.pdf
    • http://xedaptap.net/userfiles/file/ravigegejudisu.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/27956604539.pdf
    • http://lavalnerina.it/userfiles/file/buxixevirifog.pdf
    • https://intersat.lv/files/file/kizibufunezek.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419c1cd4669---55046381670.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614229c7a68e0---fataba.pdf
    • http://carbonelite.ru/file/2692774206.pdf
    • https://interference.ajoda.eu/userfiles/files/82568999481.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/82065601702.pdf
    • https://houstoncoinshow.org/FCKeditor/file/9792279819.pdf
    • http://studiodelcorso.eu/userfiles/files/madurivudomoxaxaketas.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/99080643622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+robux+city
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d9.bin
d9c1e169c37d90376d2e49270358c8d29f56e7d5dd102cdee0aa837cd0460b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 10176 bytes
font_01_sfnt_off0000c9c9.bin
9e6071f78207a4a2e727004fc43063797c682d569d9f06ff6cdc3e5473e653d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 15296 bytes
font_02_sfnt_off0000f085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.