Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d5e7fb2ceacb42…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 08:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dee9ab1cbf20f2399554719a5c39acd6 SHA-1: 4ae2a8a3fa37a73501ee59075762f2b344707002 SHA-256: 95d5e7fb2ceacb420d7b03117e8063b4d7b8bdeb4cc8207ae589fc02182791cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://nfraccon.org/userfiles/file/23928784713.pdf In PDF document text
    • http://www.deewanalarab.com/up_imgs/46278698556.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/faguponegepol.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/582739114.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/48859944979.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/lijepivudewuxubewozelejiz.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/74036261762.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/95518148573.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/30893369952.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/kaloxuterusepuron.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/kitujo.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/jurodovinoguto.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/kipojol.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xubapipatasoxojinikorebal.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/jupiperowijaba.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/fowejodomo.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/80014315335.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/zurovam.pdfIn PDF document text
    • http://vit-physio.de/file/zukerupafuwefevanawejim.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302dfc06a5e---49961314500.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/fodawebejisaxuxifojafejo.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/nizefigakelizoxadadosomoj.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/27436772368.pdfIn PDF document text
    • http://tradotel-riviera.com/file/83123297279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=keepsafe+apk+2015PDF 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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 18012 bytes
SHA-256: bb6383f7d84bc6c671a6233777da22f4e56a5290e59de8c39587de6e73f76c5f
font_01_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 10300 bytes
SHA-256: ff58b69fb5ab0a3b31d8efd12471971d8a649558944112be64e6082f01a01f97
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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