Malicious PDF — malware analysis report

Static analysis result for SHA-256 215fcd97a9cbcd50…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 05:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 594dd68e01609b9084a80ca5f9cbbdc7 SHA-1: d6936f8d11b9405d553eb5e6cf20a503542886ce SHA-256: 215fcd97a9cbcd502204147da59a2458247a8768f10d723252a74892d0fe0f09
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable hosting, suggesting a malicious intent to manipulate search results or distribute further payloads. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=the+gift+of+the+magi+by+o+henry+short+story+pdf PDF link annotation
    • http://digilit.ir/basefile/digilitir/files/75165125494.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sekekupowukoxupadu.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/99594569820.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/buvegibewumaw.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/selonuzego.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/4484647941.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/gegisuxepuzifava.pdfIn PDF document text
    • http://pnalog.ru/images/file/fibufepoxoxamexikafejukew.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/sisubabakakamiketapamorok.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/wamixazadilukufiwijel.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/didofetego.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/joxabu.pdfIn PDF document text
    • http://keacg.com/upload/files/pekoxakigumagejutexewilo.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/72676526662.pdfIn PDF document text
    • https://jagominum.com/contents/files/18183279746.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/kigaburagi.pdfIn PDF document text
    • http://cobmedia.hu/include/95864754543.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/65517652847.pdfIn PDF document text
    • http://htwy.com/upload/file/sebila.pdfIn PDF document text
    • http://salespate.com/userfiles/file/fanop.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/kipaf.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4da3llqdp5fbcsk6ot4u6q3rcl/fubas.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/78152631842.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/48813902522.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_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 11116 bytes
SHA-256: 4a9d040ad3a9d4321e30dd666dcdbddd0d09b5116a0ae73df7f6d666fbe825c2
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 18688 bytes
SHA-256: 38e4e3888ced3cd891ec7a9c26c9578521fa386aab072f99e9632a8d5fc24b40

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