Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaee589bde75b5d7…

MALICIOUS

PDF

82.2 KB Created: 2021-10-05 03:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1b8aa19e7a7ce11dde78afb70c87e25 SHA-1: f52cb926f6c6e1f11f33ef9c0a9f7e1cf8b05dde SHA-256: eaee589bde75b5d7c80fac05afaadc555df6581701bde547875467c09b3b240f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 4

  • 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://granitabrasive.ro/editor_up/69065221728.pdf In PDF document text
    • http://transporteslaplata.com/imagenes_web/file/13657445431.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/lifolatu.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/33268494324.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/xarerot.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/bidesokabukali.pdfIn PDF document text
    • http://meta-min.com/files/29698138288.pdfIn PDF document text
    • http://briztravel.com/upload/files/golabuwa.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/df8a8e77fb47d1f30d46a655c6004e83/49686224719.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/99687187366.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/4970244459.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/dugilibaxenazisonagibinit.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/wuwetutivaxuwe.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/61550719889.pdfIn PDF document text
    • https://rjpexport.com/files/seruvileregazub.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/fakulikebulikizude.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/vafikuwoduzutekulum.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/fokewadekapowita.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/96410811349.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/wekarasuvewufu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af1226b0e0---budibomunagumijuj.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/defosuratelusovosuji.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/zobul.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/xonux.pdfIn PDF document text
    • https://stotex.rs/files/98446845986.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/fibozerotevikapesixejox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+art+of+silence+book+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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 17816 bytes
SHA-256: 5890b900cf421f53c4ebf5258acff05de48ee590e7dcad78d2fa46a269e22d58
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 10912 bytes
SHA-256: 536ca034ef95c18e858e3839cbf21c0ab8eca5c09b6fa1a92f13cca40ce865cb
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1