Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f25c409c183a95f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 07:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 821160eed550120815f9583ea04f1efa SHA-1: b7d8a9721e031bd6e85b8ae998b10627b246a39c SHA-256: 6f25c409c183a95f436734b461198ec45ae99f5ffcd7f9acf28b93d11bd3a298
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to numerous unknown external URLs, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://canadianrockies.info/files/file/kitizepobevutatatejax.pdf In PDF document text
    • http://mmbc.cz/_data/user_files/file/jopepumow.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142acc5acda4---93624270594.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/zepisuji.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090316522417.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/gezutera.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/sojibadujopor.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/98983142025.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/tefatajelap.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/50351734883.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ea051376---vawemoli.pdfIn PDF document text
    • http://traviet36.com/upload/files/65958221843.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/wisolid.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/18283281451.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210914122242.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/51408232677.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/fewelo.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/jikedadazorimigamovudux.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mosamama.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/50332920537.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/zemuf.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/99248188213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+clash+of+crime+mad+san+andreasPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/28953156010.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_off0000b30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30F 10728 bytes
SHA-256: 2069f5c00417da5023c6c36cd456f1c81ed4dda6a2acc433bc51e07a1f012cf9
font_01_sfnt_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 15680 bytes
SHA-256: efca62f2eb9d276ad66c7f2a047363d564990410ffa800581ad09ce94774ff9f
font_02_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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