Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58cc8bd97b02205…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 13:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88a5441b8ba2a1b93463de18d0f497c5 SHA-1: 9f121ac08daa918ae27978f60f8bfd521ea13efd SHA-256: f58cc8bd97b022051c3bfe0d906a9551491b0bd32a00bebf101e0ead038ce86e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=clownfish+voice+changer+for+android PDF link annotation
    • http://gdfsztal.com/uploadfile/files/46152936348.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/94632845455.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/bisajuxaluturuzubuzopab.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/xivivulukojuxudaje.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/riposedibunulesat.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/vusedimatigipam.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/97567858863.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/sabetuviwebisefinagupomig.pdfIn PDF document text
    • https://beaszemin.com/files/72543607893.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/97275092656.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ilawetabevi.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/47849281101.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb650a0828---7077652621.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/roruwuxivosodi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vuzupizivipumovavuvape.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/daxewiz.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/28527101350.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/nisosixedapino.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52549390211.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/gadejizaxavukegipufusawid.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/jeguvivimedever.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/furoduta.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_off0000ad56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD56 15116 bytes
SHA-256: bf7bf2bbe22267c0ce9b25cfa28ab63d10ea0803b70cb64a32a93d8cbb1254de
font_01_sfnt_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10840 bytes
SHA-256: 15dc76476a29c74676893a96057167f491df3df7f7fe120a8ce5e6d36f268f5c

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