Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b2499984bd4e1b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d2337d4d791fe9fb388cda96cf977a3 SHA-1: 81eefdc51896ba5c5dc1cdccce3817e8b655dea0 SHA-256: e1b2499984bd4e1b88802266230c72366cfea4aa51aad617b30fda779ba5be0d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JS points to T1059.007, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=how+to+delete+a+group+text+on+android PDF link annotation
    • http://densayhongngoai.com/uploads/userfiles/file/74278571867.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/taramodobej.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/maxukemebagininulepagas.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/xofusuzizunenowijir.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/95037541846.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/lekekufekolu.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/jigadubimojaxu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kivovokexopaxiboxele.pdfIn PDF document text
    • https://amgaa.org/temp/files/kukebapexivan.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/rugolawezawore.pdfIn PDF document text
    • http://lovesenergy.nl/file/85983547949.pdfIn PDF document text
    • https://questyme.com/userfiles/file/tezanimugef.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/26466338210.pdfIn PDF document text
    • http://chinazzjx.com/d/files/25368151935.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/pasovukabufodunubumiditul.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/83772643518.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8031082---xibaremidesedagu.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/29809526150.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/11405005992.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210905091411.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/teketexokozogobopoxokiki.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/napifapiwovofeduzupaj.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/4633492615.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/julezuxi.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/gufowuvagawowim.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/75688025011.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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 17468 bytes
SHA-256: 0677e7d8cadacec38cc193c5c44963936b37e70a100d3f2a93bace7c50969f34
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 10676 bytes
SHA-256: a8a11091a9041dfd65299f7620131762bdc664e65fec428f638e497844956433