Malicious PDF — malware analysis report

Static analysis result for SHA-256 65883e72daa3b244…

MALICIOUS

PDF

70.5 KB Created: 2021-09-15 20:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fecdc548e0ea0e1fbf39c3755469c12d SHA-1: 698127b592de73c9f5f153fdf710bceda2e88e11 SHA-256: 65883e72daa3b244e675d79de95f3fc4a441a6d0cfde65b3c3f9fcea21769d3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

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://catamma.ru/uplcv?utm_term=clean+master+for+windows+7+32+bit PDF link annotation
    • http://wcsps.com.tw/ckfinder/userfiles/files/rafalufeki.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/zegobobonakevomipofubonuf.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/lapidinipilakanupigasuv.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/koxexifupe.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/60988822046.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/36231184530.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wazirasajofazakonujizovul.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/36142359516.pdfIn PDF document text
    • http://partnercable.com/files/71039206624.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60564752964.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/gedaguzegixoxidafofagi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3e0597a3---fakerurotepud.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/59125322713.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/2322867588.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/15991950453.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/zowasuxupeni.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/14028943867.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/22079865114.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/91539253406.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/98257734807.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138095f68abb---bajagogozexazujumefax.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/vafup.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/43658689583.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_off0000b4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDA 11116 bytes
SHA-256: 472d6b072d44ec1ccdb94f4779294eaaf1ee2da5f278d9030b4fd6a7c69e5273
font_02_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 14764 bytes
SHA-256: 0dc8447bd2aaa09293f51ffed390b02ddaad41b2ca4a6dbdb29a75ae4b2168bb

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