Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed3e8c6597220bd…

MALICIOUS

PDF

111.0 KB Created: 2021-09-17 08:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e827495bc0a3d7184100564fdb24a16 SHA-1: 0ccd339d108315391461f1e25bf04479e2f0540f SHA-256: eed3e8c6597220bd8c6a89103cfe377504bf02aca7c421701aab35b4a2c5ff68
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=bright+memory+mobile+game+download PDF link annotation
    • http://avanti.pl/userfiles/file/mokujoludamogonu.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/kusesipadidexusuzotal.pdfIn PDF document text
    • https://luminex.pl/upload/file/87811570286.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/31686790411.pdfIn PDF document text
    • http://m2m2design.com/userfiles/15148039692.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/65988684001.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/zeguvuju.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/10119243104.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/47637813555.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/22232491218.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/benojapuxomoxoxuxakor.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210916_0215A670B7637C87.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/18618529932.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/90810411567.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/pibisutodaxakozolulanuz.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/83931530871.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/30237430718.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/tafiserejijezapifufoj.pdfIn PDF document text
    • https://hgb.se/filer/file/tapidox.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/ratodogu.pdfIn PDF document text
    • http://badgerhillfarm.uk/tajevikulafejo.pdfIn PDF document text
    • https://istanajp.com/contents/files/16545517020.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_off0001460c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E23 10920 bytes
SHA-256: aaae2c30602e18d215296123fca43f8453b744de99ab01c0267574821f061cf7
font_02_sfnt_off00017710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17710 21020 bytes
SHA-256: fa18ba070e2351b91f3dd73d5f9f103d9e1ddfe3abcb1884f552cd62fc346724

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