Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b92e434e890e359…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 12:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e811adb62200a2ecc6ca634d789e14d4 SHA-1: 1b2d81d99e119635af5399c5f2402edab0317188 SHA-256: 5b92e434e890e3599f610e24b90e13a6b6865b9cb69797e2a34f5b9c93fa5509
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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 https://khanoomhoteli.com/basefile/khanoomhotelicom/files/78473815837.pdf In PDF document text
    • http://congtyvima.com/images/Download/16079916707.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109100420163408.pdfIn PDF document text
    • https://tarsiman.ee/files/file/69746772856.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/gobubivodalub.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/kivudixilulonipufijumagav.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/64311225147.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/wixalidafiresux.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/kasurevexuzipifineves.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/farokuwobokinafanewaz.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/69241130952.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/manapelisufojinufali.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/kobix.pdfIn PDF document text
    • https://camphacement.vn/upload/files/25529603291.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/46541034155.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/suwizujawavoganobokol.pdfIn PDF document text
    • https://isleo.com/i_photos/file/zesuviwigoxebirov.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312772166751.pdfIn PDF document text
    • http://oodow.cn/upload/file/210909094335719572pfzwdsj3g27y.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/najudopaperu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ip586ji5v1nf9uk2dvma12ciet/8711632351.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89a10729a---94590847081.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/34154993198.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/lezemomigorevoluwafukubud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=apple+pages+app+for+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_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 17180 bytes
SHA-256: d1f2c0c439d81e9d50b46e1b4f9faab6b7ff0b8e215439aa64470056c59caa8d
font_02_sfnt_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 10556 bytes
SHA-256: 170f8fb4a31dc976d8c361c95759040bf81a19a51f9986eff91c93ecebb6a1ff