Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41a8e0efdd3d55b…

MALICIOUS

PDF

68.1 KB Created: 2021-09-18 09:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bc75c40607dadacff7fb352b9041ac0 SHA-1: a81cd5d9c5ed53cd5dd5166058be438a4cd599b3 SHA-256: c41a8e0efdd3d55b26f66149202ab274f25745263569cf38eaeca52e0fb5c35a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of link farms used for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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=change+mac+android+no+root PDF link annotation
    • http://artiguardia.pl/userfiles/file/13837791097.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/xodalugid.pdfIn PDF document text
    • http://nileagriculturalindustries.com/file/3020880192.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/vexokufaje.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/toniwavusemutoriwapuj.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/melevo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///buvifunuz.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/regekifaranelepejigu.pdfIn PDF document text
    • https://dyaa.club/uploads/file/99234442821.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/kifuleveradivunu.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/remuzaru.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/96476649313.pdfIn PDF document text
    • https://doitoutdoorz.com/file/vBUCoInGRWzA7NCE.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/wozujidi.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/2635957392.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d91f7bc8b---13470765318.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/nutuzojananuzomukosez.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/73204738249.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/nemuvaxuja.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/35137739948.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/21821345930.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/zozumojupujekizokisopi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/52155037310.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109071234417615.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_off0000ae92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE92 10632 bytes
SHA-256: d13eafff29015af8852756914a5650a18f7527d10594df41c47afa58e757473d
font_01_sfnt_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 14640 bytes
SHA-256: 8992c0390762e83eb57828947d719a450adfaeff31c12bcd98d76895de0d299e

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