Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee8a2a675b156f3…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 06:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3415633c3cd028593cb8107b576f294f SHA-1: 1459e25e5ea5d74bc0ed01da94822fa42ca47baf SHA-256: 7ee8a2a675b156f311d9cf1bf4e413d2e36980279d5f1d4cfcf79759ecf4b25b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=chrome+stop+loading+shortcut PDF link annotation
    • http://ephtour.com/FileData/ckfinder/files/20210914_E27F2B196DE4FB89.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/27320833959.pdfIn PDF document text
    • http://kyea.org/imageuploads/zuwuz.pdfIn PDF document text
    • http://wirheiraten.de/images/file/womonik.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/jaxizekofedexus.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/lazizop.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/vitidepow.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/teligikiposa.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/logapok.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/lodutuwela.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/tosujobebexasidija.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/30069179174.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/13128918656.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/gituxedegedufofugenave.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-29/20210929171848327619.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/8469570511.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/83847623490.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/54189371904.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/pevejogosigogofedi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613807fddb21e---23131505562.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/nuxunokusesutiduj.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613969a05f4d7---nudedoporamemevoz.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/55304226972.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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEB 17284 bytes
SHA-256: 284ff3f9b2409f7dc5b3a03c357efd7c0ec5618cac306ec3e563cb3c8d1b7b46
font_02_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 11092 bytes
SHA-256: 57c24b1326b0d29d738f7e80a68f99bff287e8ac01aaeca5b1b8ab0621f8c2cd

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