Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f21feeb570fb89…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 14:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f73877947c13f3669db6817fd3aaa4e1 SHA-1: f513392530b6bef28778d56b4c21cbfb621d4877 SHA-256: 83f21feeb570fb89c8f2e4d430e52576cb1b6709acd22d8fd4041007ef94e25c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=pokemon+mystery+dungeon+dx+team PDF link annotation
    • http://unitec-egypt.net/userfiles/file/fujezexosanob.pdfIn PDF document text
    • http://whatdwellswithin.com/file/zolivutoropapiz.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/tifiwi.pdfIn PDF document text
    • https://petikdaun.com/contents/files/28238578559.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/19011600534.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210909052702199.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/39312783961.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///2986095666.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/fotuvotuvevuxut.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/norezijerobipas.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/93149928093.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/41475119324.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/tupugotexu.pdfIn PDF document text
    • http://maulich.vn/attachment/files/11148949602.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/41412050920.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4f34414c---zajudanijunexazeduxoguxin.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/62231193865.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/tatovuzoz.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/tixososotobizage.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/86542209051.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/58q60suhseg5cc1du3d0197k1g/35026316625.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/34743192994.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/sikenolowi.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/funod.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zaxidumexiva.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/zuwulenibodotujezolojibe.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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 10860 bytes
SHA-256: 056b0b915ca9d797593f9a6e96cf71221a11d797fe7df328960b46fd107c0532
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 17636 bytes
SHA-256: 760eb92eda11423fa11f3ef272901bf40d09d7ec035704912eb68f81535ec5d9
font_02_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1