Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19c59e8ba46d78a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 23:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b9c54209c64cb8a2c6dc0f00e795f4e5 SHA-1: e41c625f0595dd608f91d9ad5c26b23cfb0a2532 SHA-256: e19c59e8ba46d78a53f02460cda5cc18538bafd3fb2fd9af9a9a7816bcafd4f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=video+downloader+for+instagram+mod+apk PDF link annotation
    • http://delta-serwis.pl/pliki/pulosu.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/sodixoxopi.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/75606554470.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/46738840973.pdfIn PDF document text
    • http://banquat.com/userfiles/files/55758051410.pdfIn PDF document text
    • https://highrise.pl/file/66352307007.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/32607678729.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daf9333808---79743428011.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/nujeniwafubo.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/wegazadasiligaxojujaz.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/75905166269.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/dovujitobavijumisulit.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/ratip.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/2436816946136904b25f77.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/jolizimagegu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/26829969201.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/62657295396.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/9695507952.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/72080496314.pdfIn PDF document text
    • http://otczenacts.com/media/files/99767796687.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/17727637859.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/kibodupubol.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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10988 bytes
SHA-256: e1066ce2a8c05cb5db7ae4dfb35bbebe2e2cbb0fb11a5acd6134b571bfd44128
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 17676 bytes
SHA-256: 15ac6c4815339e5290cbdd9f2aff05f99e94caaea849d1fd190538218430401e
font_02_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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