Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad160303ea2b6eda…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 04:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec67b0a02e6befc1f72e1c04a6de675f SHA-1: dbd97eb0112bbd95bf8d835ffdd3b9897fe7b9d7 SHA-256: ad160303ea2b6eda078f57cf816f1199e4dd9769d469250ede4519d93525cac4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host a large number of links, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dsfly.com/uploads/files/tawosamebefikuxis.pdf In PDF document text
    • http://studiotecnicopinto.it/userfiles/files/satot.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/wotemebexobor.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/ronisipivitapewenin.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52096913185.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/boleb.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/70366475100.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/35557588864.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/62796459348.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/81466220342.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141c9cba2b76---tadadexolodo.pdfIn PDF document text
    • http://tochuchoinghi.org/files/79624823171.pdfIn PDF document text
    • https://umutfm.com/resimler/files/nugunozurupezapome.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145380a8f408---10466670933.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/pufefan.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/82678866233.pdfIn PDF document text
    • http://lawngo.net/fckfiles/12447887584.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/88603881520.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/21418366633.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/kafexuzot.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/58085839712.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/witewesawiten.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/18931078584.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/8292611047.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/venodem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=among+us+lock+screen+appPDF 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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 17636 bytes
SHA-256: 2c9d8fd5bb711ef1a0ac710038a85cf5801c6d4a0b066ce5ae71093e59467986
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 10700 bytes
SHA-256: ab53a58b638b1f2c68450e5cf4ad412be46d0319aaa2379fd3236fc11b7b5397
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1