Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48def03461cf880…

MALICIOUS

PDF

75.3 KB Created: 2021-09-26 16:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea1ee43be3dbcc077b279993ae2d49ea SHA-1: cbf4ca11a11b5aec06e1d615508572ea637bd141 SHA-256: b48def03461cf880b547d0376b18f32d858bf17e94b7fed8d22cf9c5018c23a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and act as a link farm, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=how+i+met+your+mother+season+9+download PDF link annotation
    • http://pierrevillers.fr/mairie_files/file/pipimuzutonip.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/juwez.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/nolisisigilovaga.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/42123424574.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fimufageti.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210911213544.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/wozifilonuseporixog.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/vizomaselesazewaf.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/59912022669.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///66922949358.pdfIn PDF document text
    • https://partetesal.ir/data/file/57871227726.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca6ad1165---96850784312.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/27957856196.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/gegozunoribepo.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210924072120_461530.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d95b8400---nifajuzemekawubuvabod.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/61557977067.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/16557172656.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/sexudetidadodaritep.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/25595419001.pdfIn PDF document text
    • https://renetravel.ro/images/files/88173555591.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/73284521275.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/68549001023.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/36012376099.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/21560772283.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_off0000bc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 10972 bytes
SHA-256: f3bb895a2ddbf4659f513b97b531ad10a2b5a86398cd1b6040d5ffd76fa00428
font_02_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 19220 bytes
SHA-256: 72fa124620e0a88d40a46e34337e928617b6063065f9cb498f4f96bbab48b23e

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