Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26c9421668a0b43…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 17:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 982755694f82e851dedbea463bcffdc2 SHA-1: 6aee8ed423fbc3e3b27433ec2528fbb960030ead SHA-256: a26c9421668a0b43d9e003e0d14fb63df1edbe23d8dd4dec654e00e8d87aff42
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 0.9963

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=class+8+biology+textbook PDF link annotation
    • https://bandotrading.it/uploads/file/gunel.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/28704066133.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/vujaji.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/lugudexisenedo.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/95461536691.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/3368000502.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xorixonixezubiwedupixefef.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gurilarubapufarivopafa.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/84167840933.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63840ad54---20891643867.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/98015783187.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/tafonazibop.pdfIn PDF document text
    • http://marketingnews.fr/images/file/18314291919.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/febufutigimewesudonik.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/jumobu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/negamotimavemad.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/dawiwonimur.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090520262370554.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/11638871050.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/93951142586.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/27110302626.pdfIn PDF document text
    • http://josquin-capella.de/download/tabejigakusab.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_off0000bddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDF 16672 bytes
SHA-256: 0c398bdd84c5e55542ef0c072cdc4440a542df491a6051c2207ffd9b62f92f4b
font_01_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10768 bytes
SHA-256: 1aa4332cd1553cdecda9b377a6ba41cc6f9fa8eb5daa206b085c48b32a0de09b
font_02_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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