Malicious PDF — malware analysis report

Static analysis result for SHA-256 866f6e725b0afbca…

MALICIOUS

PDF

76.4 KB Created: 2021-09-14 12:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba339fd322da94abab8b4adfdcf7d4f4 SHA-1: 293b875103d326ea31f806af262436ed06160642 SHA-256: 866f6e725b0afbca63ff059a51e77a205ae0151f9c3d92b6f593301a12f8b7e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=sports+tracker+premium+apk PDF link annotation
    • http://www.vljainandco.com/userfiles/files/kipomafipefetogegeluzozab.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/55034993581.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/muberonuremi.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/vamutukekatuni.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/4988476086.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/34361865240.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/budupebotovadubex.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/72292416578.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906053517275018.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109121958276732.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/felofeb.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/88525665606.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/56541151377.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210907125653.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/36006550112.pdfIn PDF document text
    • http://proxima-design.cz/files/file/40289964036.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf9187148---vemupisofimerosadenod.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/kasedulepazixulasajanudob.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/kizolusa.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/koxovusikanev.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/63052739902.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/riwewo.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/71321562427.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_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 16656 bytes
SHA-256: 5a091c5b73170ed62e80b2c928d88c8599137b336a256191ce349a9caf4246fd
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 10652 bytes
SHA-256: 13a7d577b96c406c631a156e3766703bf8c525379a48ed7a5d04617cecb74b80
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1