Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb663531121e0db…

MALICIOUS

PDF

63.6 KB Created: 2021-09-27 07:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e30e166efb3883b30807c9209d1fdf0 SHA-1: 01d1d42f2fe4d839b3939100be91c89a540ec745 SHA-256: 4bb663531121e0db2ed6d332484372db839939a2fc55fa0de1aa0ba8f859950a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to distinct hosts, indicating a link farm. One heuristic specifically flags it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', suggesting a tactic to obscure malicious destinations. The presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

Heuristics 4

  • 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
  • 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://anael.fr/fckeditor/userfiles/file/mesuwifimubemumatisuboxew.pdf In PDF document text
    • http://abwlargo.com/uploads/files/68294609247.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/64148036111.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/muviporiwegasuxawiru.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/12767271319.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/18128672184.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/bojazozazarokasaxifosoni.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/34847114523.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/jujigekegesobujamozob.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nuzavogozogu.pdfIn PDF document text
    • https://citytrafik.nu/images/file/naxuzo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/4055736724.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/lesedabebab.pdfIn PDF document text
    • https://protum.se/file/katatod.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/19716815719.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/xerowa.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/77928748150.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/16005825215.pdfIn PDF document text
    • http://sun-tes.ru/files/file/77196054576.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ecfdc4bd4---jujezadodukixejapulixikub.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/kexokumivuro.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e5bb22d9---mixuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+send+to+kindlePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDC 18892 bytes
SHA-256: 488f3b904610ac63eb2a95e5c63d2a671b490bbd1564329a34b10cee6ea11842
font_01_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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