Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc853048970c34e4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 00:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3500891f2b6c66b536ae07773dd889a2 SHA-1: b305cfbb3b5355186117c689608ebd705610287c SHA-256: fc853048970c34e49ea4cb68d8c126d725dcb14f57b998ff77ce76db67aaa355
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=apk+free+fire+max+2021 PDF link annotation
    • http://princeverma.in/uploads/files/48305306342.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/334023105.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614389bb13a73---lugejuxomap.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/tevodaniwuwubejusekereke.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/tiwobor.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/kopewatozeziwabekas.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/71381132518.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210916132210.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/tivitor.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/40182185710.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/wudunob.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/19874861787.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mevesevotenopaxuma.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/57731896448.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/lobupuximilorotavib.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/gk007p18qlaovndq673h94ffgi/wagivipo.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/74466347314.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/20562247928.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/kasesul.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/16994672874.pdfIn PDF document text
    • https://educhina.mn/editor/files/kanuzovimefupu.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/49968124321.pdfIn PDF document text
    • http://idcla.net/upload/files/xojolifevedelimoj.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/63171271097.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_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 17552 bytes
SHA-256: 2b0b83f7d7cbf371322f41cf62e6bc35b2b1d38ca4665abdc7cf1a2c0f42c98b
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 10452 bytes
SHA-256: dcf313e55d748c2e8802264f3ae4cd534b8bc1b05da8a8099bd812d8b484149d

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