Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef9c51033b69b8a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 18:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dee467c69a2915c0d4a3a907126e7b3d SHA-1: 5028ba2ad9fd6f72a30264ae2eae24091ebd1baf SHA-256: bef9c51033b69b8a52f736853ad277a6eaec6cde5b87dde81efecb7a6d7c59cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/70803159240.pdf In PDF document text
    • http://connectcontrol.net/files/userfiles/files/90253916042.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/wizifovubararolabeseviza.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/71863987935.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/dapagovelisilibewivipizu.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/73094998586.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/tezosedogitiwikonenuse.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/49365096539.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/sonogotosutenun.pdfIn PDF document text
    • https://wittnebel.dk/file/97260433446.pdfIn PDF document text
    • https://zzhqhi.com/d/files/15360555968.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nijajawoxivo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0387eca9ac538ed02568ce3beba59a27/tonetovebez.pdfIn PDF document text
    • http://1carl.com/userfiles/file/43568429430.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/17352355459.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/zevitovazemubifuzo.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/kukotizumejumaxu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf452e796f---78028017980.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/80330885890.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/69827986747.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/9749511145.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/24093865825.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/filapozizozo.pdfIn PDF document text
    • http://tid.vn/upload/files/49492778616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bank+of+america+mobile+banking+app+androidPDF link annotation
    • 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_off0000e3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 19240 bytes
SHA-256: 24e0242972db7de8e4dae98a541ab6a8ba59be7c154e770634dc03d88f1a51c2
font_02_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 10984 bytes
SHA-256: 16ae6b3d4f890664168e379e90c66507e722dad089a388c89477a89496df08db