Malicious PDF — malware analysis report

Static analysis result for SHA-256 da05043ea706576b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-08 22:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9605e5155ede09b40734042cffd12e01 SHA-1: 683714c51be0da5877211e5a827fecae3b71375a SHA-256: da05043ea706576bd0bfecae56a77bd484a18663a76abf6dcb0312060a9fb811
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point towards a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/nadoxokisojikajaxasojurug.pdf
    • http://tidomusica.com/uploads/files/202109060107158612.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613204eee6c4e---52019416793.pdf
    • http://rosabaum.de/web/editor/files/mowuruniridin.pdf
    • http://espokebar.com/uploads/files/dojekov.pdf
    • http://challendor.com/fckeditor/upload/file/widev.pdf
    • https://jmtours.co/aym_image/files/73809801208.pdf
    • http://thermocomfort.ca/userfiles/file/57809946066.pdf
    • https://dom4m.lv/userfiles/files/xadisozikijujoxidufezolep.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qecv63ijuftpmkj97be8irgcrv/78854534601.pdf
    • https://capecoralliving.com/media/file/puzuwavawe.pdf
    • http://stalmont.eu/userfiles/file/59311802300.pdf
    • http://robbes.nl/media/files/75979652682.pdf
    • http://3qbuy.com/CKEdit/upload/files/dukoluwomikokufa.pdf
    • http://vkp.ru/upload/global/file/55789748825.pdf
    • http://ageddfjtjgrade.pretty-match.com/upload/files/tuwedikewesifikom.pdf
    • http://bindashnews.com/userfiles/file/dotifomokubezudugut.pdf
    • http://maybomnuocdanang.com/uploads/image/files/bowodubimosizi.pdf
    • http://j-club.eu/userfiles/file/kemegobofevikumawoxukuv.pdf
    • http://brcassociati.com/userfiles/files/ruxufuwofimitugo.pdf
    • http://islenapuntos.com/campannas/file/65002479817.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+deleted+pictures+from+android
    • 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_off0000b437.bin
af6123013f68dbeb420e54df6b696386b28ea90eb8ea6d7efd7e5409c9bd1328		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB437 11140 bytes
font_01_sfnt_off0000ce07.bin
3d161b9bbd436e6bf174588789cca190c795b547fa70e4eedfcdaba17a26b5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE07 16904 bytes
font_02_sfnt_off0000f920.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 16792 bytes

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