Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb48b683c9b6f52…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 14:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1639050dac8c8cf0002e6871995cd691 SHA-1: 17edb47230b7d1b989272b0d5e5fccd1dcf6aa0b SHA-256: 9bb48b683c9b6f528de9f59838e33da734fc6ab171e6b084ce0597bae69e6720
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://szermgrt.hu/uploads/ckfinder/userfiles/files/zigixawusisilo.pdf In PDF document text
    • https://sanvexe.vn/webroot/img/files/kidejax.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/79326374246.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/9983729956.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/rirumazufugupogufafojuxi.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/56304851049.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/kazosodituxebedepudenog.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/94974304943.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/44132643893.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/gipuzujaxegakogedowadom.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613690171e954---joxajugogirigurumumumuf.pdfIn PDF document text
    • http://bronia.org/userfiles/file/51174143433.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7r9fsrmgsihh7lhphdsj95g6d0/27225960631.pdfIn PDF document text
    • http://meta-min.com/files/pufuxidoderezebinit.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109090301156413.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/rupufevifenidadamemazuru.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/rilogelixixibex.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/46366900281.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/piruvojiwi.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/sedotisadarakizurobe.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109020817331696.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631441666.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109071255574654.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/joropenilisisoker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=john+wick+4+full+movie+downloadPDF 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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 10788 bytes
SHA-256: 67db2e2557e526d30fa38596b2e46a934c1f7601ffac1fcbba42e238f1b00eaf
font_01_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 18340 bytes
SHA-256: 9ed15ee490875153c5a548114023f2bac2736bf540c91800335bb3b03a2e71b1
font_02_sfnt_off00012df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1