Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf7f31fa4f60591…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 23:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95b4d6fad31f097f742feaad4080ea0a SHA-1: 3f98ddbbb2f82bda91dfb07e6fc9eac856db61e2 SHA-256: daf7f31fa4f60591397818ea6c295be7c30f7f88e45237145fe26f2ab4aa393e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host many links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further confirm its malicious nature. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

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://chcial.ru/uplcv?utm_term=allow+mtp+connection+android PDF link annotation
    • http://incomingmakedonia.com/files/files/78108793798.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/ginokiwibatorafu.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/mejem.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/vatiwufol.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142795711c31---gujifufulugoxuja.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/gegofijofefatidofi.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/suwofenatevu.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/limamamixenuxiluvoto.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/tulavuvobevuf.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/wemivilubugekakawawugasi.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/97154061894.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210902051907598053rmv19.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/fegina.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dd70b798fbd517a4909157684fb36557/62800266426.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/74929126230.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/67345963845.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/25345412759.pdfIn PDF document text
    • http://ipublicity.cz/data/file/82604387292.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/51604166048.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/kijit.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/wugomulutitedidowikereji.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/31300546046.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/84871373231.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/kimavurobepijelubimire.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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 17236 bytes
SHA-256: d0a5100fb77eedda2f4550c0fb4e78f84f5728c14bac2ee8a286042f48dd552e
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 10576 bytes
SHA-256: 2d0baf18c9249fa845774d12e73be57fbd6ad768d75557607bca5416630148bc
font_02_sfnt_off000120f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1