Malicious PDF — malware analysis report

Static analysis result for SHA-256 536d93c157af44d9…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 07:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d94ac558654618faeca2a49e3cebd2e2 SHA-1: 6c9a0a933eb096815112055321d8fb7f804fbec6 SHA-256: 536d93c157af44d92880a1f107baf7ffc4fb9613d49ea0930ac9111d6a9c7ed5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://abcbyspu.com/ckfinder/images_store/files/84244602230.pdf In PDF document text
    • http://trips-in.com/ckupload/files/sifenokizimirofu.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/5185889536.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/refodi.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/88503721477.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/nazixinuzavigasolelodu.pdfIn PDF document text
    • http://gazetavk.ru/img/file/gawepo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344de5c66a2---85756713755.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nusefut.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/tukelero.pdfIn PDF document text
    • https://kimcert.com/E/file/lududiz.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/29657554185.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/zusijedajoxafi.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/55669449110.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/73991197667.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210904035534.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad25a31af---dupazetotabu.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/52435802847.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofiwiruwezurep.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/pizopovaxiko.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/devuvubuxelupuju.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/48991257184.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/22916821103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+create+listviewPDF 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_off0000c234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC234 17552 bytes
SHA-256: e2f66c288e8536c3221d6b61618d23a1186db5b542342ac8656149b18c47879f
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 10496 bytes
SHA-256: c97ccec6897bea43eee7034ff18a9b9d9a773fe9ee0ac085efee9838899792bf

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