Malicious PDF — malware analysis report

Static analysis result for SHA-256 d100a7043859d584…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 18:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4f48a09c08c5199c850ce365ab8e5eef SHA-1: 8f035b48572be8ccaf12d3d85b94169bae4b3fc0 SHA-256: d100a7043859d5841ce70b48c9c9ae12636fd927417f8acef5d9b160d60c1c07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=pros+of+nanotechnology PDF link annotation
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/12464783305.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/76949167180.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kefuvutalotarekobojimal.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/39478617521.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/kapemobodejalomuduji.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/99051777398.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/892330408.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/16428859533.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zuramalutok.pdfIn PDF document text
    • http://sartor.ru/upload/files/getotemubuxokosokiwo.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/jamajarasugunorijobunu.pdfIn PDF document text
    • http://skupka23.ru/upload/m/54206922138.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/fupegekuxi.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/zetemuluzubarujuv.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/nogasitodukulusis.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/85401093385.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/18317823674.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/pivusebiwuxalu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca0e7d857---10097807381.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/gevufokik.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/82016709476.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/74145677716.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161309290eb305---25482530462.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16392 bytes
SHA-256: e2087365c50517ff64ec40e28f5f245fd5f3e875e6975fc0d2dc52d889897cc5
font_01_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 10640 bytes
SHA-256: dc679d501a74357c32cd511733a5322e36d3e08e5176f32c076083afd14140e6

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