Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba527fd63988fdc4…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 13:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7fb772f4bb6d315ae6220639cdb66a3 SHA-1: fb1dcaf71c0ca3a9bf5837194fe2bcdf1292100f SHA-256: ba527fd63988fdc4c26b73fcbdf585c752b070871d8b3a89ccbedc1e23368cf2
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious or deceptive content, possibly for SEO poisoning or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://precisao.org/files/files/42882092457.pdf In PDF document text
    • https://susta.vn/userfiles/file/92975261310.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/51199626723.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/69820419391.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/ruxelutesubutota.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/93525040982.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/86767534501.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/78892266513.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/49094775169.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xukorixigosovet.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369fda9fb7f---48147007875.pdfIn PDF document text
    • https://fivetc.net/uploads/files/figiduduwexupiwebixeviwo.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/wideluwazujawepina.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/36374613265.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-09-07-21-39-48.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/50961391348.pdfIn PDF document text
    • http://darstin.com/userfiles/files/dofixow.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/fejipo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398be8a9196---pokipu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/62830277675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=offline+battle+royale+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_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 10456 bytes
SHA-256: ba1496be1ee2659d9faf3c741d8908d2583048f236d6792f1d315e8fc87d7710
font_02_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 18404 bytes
SHA-256: cf630dbe7c77feae5d5a6713aa065da965e5b7497b7a051329db9f5cd7c63dcb

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