Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8158ba4d5930270…

MALICIOUS

PDF

73.5 KB Created: 2021-10-07 05:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4633510b08f92d98a4388b5fbc6f2e8 SHA-1: f0077edbedb917a95a54b5d5c196afdb92385990 SHA-256: c8158ba4d59302701f1cbcccf32ef5f7b4ab06890cf69c8b838b3fc9ab4ca2cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=female+thumbs+up PDF link annotation
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/69e47ab41d3df4ab4e52b2ac2af1d258/wiraxeduw.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/vadagavipiful.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/75443232226.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/rodokuxevuzisidu.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/siputofokopure.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/lutapofedexofizesi.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/kumokibamawoseresoj.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/ludazuxusarajarobotigovak.pdfIn PDF document text
    • http://360global.ca/userfiles/file/wefaribame.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/gudojimijasalof.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/rumoralapej.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/89611976219.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/lakavopi.pdfIn PDF document text
    • http://guowangcable.com/d/files/tasedas.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3216a7fae---99132196261.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/pirewubobijatabofewixag.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zagupuvijos.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rivalelazazomosamixoxape.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/vibojikewofikagewu.pdfIn PDF document text
    • http://secretinvitation.net/images/files/nasesepekogopepozubo.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_off0000c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10316 bytes
SHA-256: fe62344e6e665a9a83a98d30774d41e306192c963eb0bb89c3108b7a4b45a151
font_02_sfnt_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 16168 bytes
SHA-256: 9ff7d9b9d441ff7a05d971f70c85d025c0af2de2e54a06f1008cd389f065b574

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