Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a06a8536da743c9…

MALICIOUS

PDF

82.1 KB Created: 2021-10-04 17:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b4cd9b2f65d0570acf1456c7f87e446d SHA-1: 48ce3c12654ff8582d6c8e214a67175fe5745efc SHA-256: 6a06a8536da743c927b80cf0c64deefd6f0348c2a7ffc44f20c48bf44e5bfe30
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs extracted. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://phamtrangia.site/upload/files/86437911776.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153064980e63---nodusulil.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/dubaveno.pdfIn PDF document text
    • http://skolky.info/foto/images/file/wowok.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/jovoxaboxo.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/75699697855.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/mebaxitesaninumalegizudib.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210908_6EA1041E13498103.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/burep.pdfIn PDF document text
    • http://headrepublic.pl/images/files/nerozebajapuvipem.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/lifosaduvigovujasodevix.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/gujuralarawitokotadovas.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/66600975121.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/sexonuwurovimef.pdfIn PDF document text
    • https://domilot.com/uploader/files/71513677956.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/bivazi.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/sedan.pdfIn PDF document text
    • http://wych123.com/upload/files/97191180149.pdfIn PDF document text
    • https://nada70.org/userfiles/file/97591068103.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/vaviweminekajo.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wokegux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=250+pounds+to+gramsPDF 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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 18376 bytes
SHA-256: 2e559ea47d379b7e3104959338644725acbab6e1bd21dae6f34c53cff3a6d89c
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10844 bytes
SHA-256: 2041464f0136e3c013928b920c1e911feff965e86b09201b27fa111111ec38e6
font_02_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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