Malicious PDF — malware analysis report

Static analysis result for SHA-256 574be5bbbe86da78…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 07:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3b8a6662e02c0648774db6dbf806da4 SHA-1: 8c2a1f1e6388b50c5ec05b6aa6e7c17cb04bc4bf SHA-256: 574be5bbbe86da78a3cbe5ee2201aaa6c5a757a38358ad34052399279d76f776
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=android+home+button+long+press PDF link annotation
    • https://lenaoyunlar.com/calisma2/files/uploads/zizedafejitewamid.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/wavexudikoxaz.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/tenepefaba.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/mobawosodesudo.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/bigobetudosot.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/pivanijarozuj.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/53421629086.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/13839196116.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/zeteguk.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/maturazevasepa.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/63374805640.pdfIn PDF document text
    • http://jump360.co/upload/files/20210905152135.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/lisirexi.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/90753953803.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/38866002836.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/jalusikewap.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132221d1cdd8---45732031179.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/16996369274.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/vigoxijesokiwelubijoguz.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16138d01907c30---zogotowavi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89595344a---17442768521.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/30883033622.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/9579523121.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_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 17692 bytes
SHA-256: 9b5142481e42b8a57ad887ff050ff010f2109ce0247baf2281fc04333408356f
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 10900 bytes
SHA-256: a424709341f23073d51d26aef1643d72dd8b2144348457ee2c9249dbf17258c6