Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9404a86d21b4f3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 01:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e1b5376d681c6f78c88aa550ce57bcfb SHA-1: 2b4d847e9d0a2f5a2afd1454c9713443f8d5d497 SHA-256: 2c9404a86d21b4f38a35e01a49c999df142a78eb2dacc32221e62b379156cc29
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to external resources, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://showdoimovel.com/files/files/tapusebixixulutalosixiv.pdf In PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/rubebugosoxerejolaxin.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4036351987.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/85616086757.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/5850380676.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/66500942970.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/20039508661.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sukizijanujezosuxawo.pdfIn PDF document text
    • http://runhouchem.com/upload/files/rirojubozugukagav.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/66781598519.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/17478465696.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/rawigojotogiviwuz.pdfIn PDF document text
    • https://drlanda.hu/user/file/xilalodazidupoxuselixiw.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/28791107530.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/golezoxanuxip.pdfIn PDF document text
    • http://irths.com/upload_files/files/4410541473.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/7470068716.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109050514215474.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/88995591399.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/ripobijoka.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/54864929840.pdfIn PDF document text
    • http://freeorden.com/media/file/12087447640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=windows+8.1+pro+64+bit+product+keyPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/58067890075.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 17348 bytes
SHA-256: 5381ab35321676be13ebbcf7a3578243feb1fe21daeade7e7bd97d7234025acf
font_02_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 11396 bytes
SHA-256: decc14f2ea3ed007499a9c40899b78bc7ace6c24de0a4194ca5898c4f5a1df8b