Malicious PDF — malware analysis report

Static analysis result for SHA-256 f635805e2d42444d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 14:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f80bfb06481f7fabeef373de30550b06 SHA-1: d4d40eeeebf5dc027cf992519a97868d6f16753f SHA-256: f635805e2d42444d56e6149e5adb67ce669af054a3322da970274d57934a0062
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically linking to a download for 'Adobe Photoshop CS5 full crack'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver unwanted software or malware. The presence of embedded JavaScript suggests it is used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=download+adobe+photoshop+cs5+full+crack PDF link annotation
    • http://monterroso-construpuntos.com/campannas/file/47709963440.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/28209443764.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/razejoneg.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/78770389732.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/41305560028.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107f0a30c3---sutisubagujufujuzufesiva.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/82356297977.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/28810078503.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/38587579458.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/mitopejorupafuveke.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/wugegidilutobis.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/65098193612.pdfIn PDF document text
    • https://orrizon.ru/images/file/5726174742.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/39147911515.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/nonokorenazixa.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/51793121695.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/98147553039.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/92d6elf9soeh6huhm0s72uke9q/ruwavus.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/56426476515.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/juluwowaduwegotov.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/87562426413.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/bazetesonutexum.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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 17472 bytes
SHA-256: 842619312d666adc9ce26fc96a2c516c3de80226dc3196d222c22ffc17d62063
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 11176 bytes
SHA-256: cb8d47a30a3343cad6cf6eac7fc4180994bb7ae3312ef7014f017db6078fe3fe

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