Malicious PDF — malware analysis report

Static analysis result for SHA-256 582e00ecf9c997e1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 04:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 262868bcd1912f9aa2ddd1c13f360365 SHA-1: b7082c850e36c278268869860a0862f7b8392455 SHA-256: 582e00ecf9c997e1bcad8037fd365e0028be6068a94a4fc31f0a0138abf84479
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=descargar+emulador+xbox+para+android PDF link annotation
    • https://pabxlg.com/userfiles/file/muvonogerevufawil.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/41486602591.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/fegeg.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/misalov.pdfIn PDF document text
    • http://marymo.ru/uploads/files/nugogulu.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/rusotumifozuxanadubiz.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/14484779891.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/rulolabufemopuzelixobevun.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dudos.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/19805823943.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/wologi.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/wejudazezidizelobasuz.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/ganilogifinakan.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/16383692091.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/79500759484.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/tekibekepefizozej.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/54100106982.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_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 11100 bytes
SHA-256: 814908ddadd4ffebdfb0e0ef488497669f1e9f34e38ffc4f95a92d499bc0472d
font_02_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 18048 bytes
SHA-256: a60f9cc96a82b19cc3649d4b447aa1672b95ecc4f9a293e60163ebb1c256def8

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