Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a675bab2fd314f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 21:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbe6a7a4714d0e25f4f8de0c1f8cc765 SHA-1: df7d86b402a4502fd7db1c6b46d746cf3ac20ec3 SHA-256: 65a675bab2fd314f55d9cb3da312c864ab784e45e88d236a7ec4db59af62cb1f
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with the ClamAV signature indicating a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on potentially disposable domains. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://serviceservice.eu/userfiles/file/sinowozugesijeruwomudoxu.pdf In PDF document text
    • http://leganordavigliana.it/uploads/file/fawolejepojomeken.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/84043337407.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/65486237143.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343deca8f55---vanatemuvavobiseri.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/92981130170.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/83135593736.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/tuzep.pdfIn PDF document text
    • http://newmob.it/userfiles/files/76442291560.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/15602898168.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/tejawomudesiputusop.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/98609654297.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/80917236315.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/88923939514.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210903120233_gdgvm8.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/xesopubusiwo.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/mojijabuzaf.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/towaxavevejajowumirubabor.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/85619653861.pdfIn PDF document text
    • http://chipgene.com/image/files/20210909_150306.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/64200531614.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/vapezimisawezokuz.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/venafibegusogebumigogav.pdfIn PDF document text
    • http://nincity.de/inline/file/61835878466.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vixoladi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/72661470804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gardner%27s+art+through+the+ages+pdfPDF link annotation
    • 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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 10812 bytes
SHA-256: f4e58aa5767926bf5dce4d9e0756276b96016f081655509c00b34ef2ab7c4e31
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 18112 bytes
SHA-256: 70c5a2ccfc83cad3b751b9c78559d5760f3e818b9c7315429c29a1060e52b314