Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd232a19285f6fa…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 18:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9c873345ca2bda667b90466306eb861 SHA-1: 5b6e46394ba5679ecdaf12353cc0784c02eb4e26 SHA-256: 5cd232a19285f6fad98c46da8620e7c7f8ab8582d5904479c647239f8682f38a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate further malicious activity, potentially through a phishing lure or by distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://irlanc.ru/uplcv?utm_term=lucky+patcher+apk+android+1 PDF link annotation
    • http://regimhotelierbucuresti.com/images/userfiles/daxuzakosatemisada.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/37093736672.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/kobaf.pdfIn PDF document text
    • http://zubrcup.by/files/files/28645072869.pdfIn PDF document text
    • http://nemochem.cn/upload/files/mefojilurokivunanunugoku.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/94222145104.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb48c401f---kadarojetaredakupex.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/72022464638.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/63210178751.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/53945567978.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/34469921.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984757242a---3474761825.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/penifixovapuvifolapu.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/54726426423.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/42770915178.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/73392257975.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/kenarori.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/53574729944.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/vagemerabenef.pdfIn PDF document text
    • https://km2804.com/ckupload/files/25722681953.pdfIn PDF document text
    • http://tfforming.ru/d/files/tewowamunamekadudoxoper.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/erumoniju.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/tidimilomexorilazajuvemu.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_off0000c5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F8 10712 bytes
SHA-256: 00fec2f07d96faa18c36e615ed0f5474d729ee80d21a026cedc72b0c3ba98086
font_01_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 21400 bytes
SHA-256: cf433dcfb7aacb93c205cfd12b0d539d45a029c8e617a6803b808c253b52144b
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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