Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d125fbea62e457e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-15 20:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22f94e9d1a9a0f69e7bae92848e9fffe SHA-1: 266207e169dd0527a671493aa1c29c8650553618 SHA-256: 9d125fbea62e457e3c9ff5ed4b58e466b1a430538d7c8956d35090aeda683ea3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=dashboard+ets2+android PDF link annotation
    • https://projetounificado.com/uploads/files/simijiba.pdfIn PDF document text
    • http://mqskin.com/luutru/files/vobokipiredodasa.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/voxudasivino.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/6107318651.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/jamupiwume.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/28315300269.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/8348598283.pdfIn PDF document text
    • https://esz.jp/img/editor/files/jararozivu.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vojirafug.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/zigewexako.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/77191239665.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///14187202621.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/91943745002.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/bezedixamomat.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/zafewuzonirupug.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/tuxogukiso.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/wutifiropubojomerex.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/nijokigiporaf.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/kerevezo.pdfIn PDF document text
    • http://snsi.jp/image/news_file/gibunazesukuroluzefedu.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/71646793770.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/99346388914.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31065217724.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_off0000b33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 10560 bytes
SHA-256: 48be990d3026aca95fa690083e8babbd5b7e5baa11392aa854490cfd7ea2b47d
font_01_sfnt_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 15880 bytes
SHA-256: 5c6bdfbed0503ddd5acb3a112fa1bd7a57cea1275648d095dcc1ca4de506447b

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