Malicious PDF — malware analysis report

Static analysis result for SHA-256 169ce9fb38a5e919…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 07:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7cce6fe8acc0222e3dea3c58d822dcd SHA-1: fa1c612f6561ecf1f15ca98a5ee7cd6af67b1b52 SHA-256: 169ce9fb38a5e919c364ac8ac34cad88d02d98955205dbc62c47a20f833a00c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://rc-modeller.se/images/file///11964094467.pdf In PDF document text
    • http://to-tuong.com/media/ckfinder/files/rofus.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/24004062863.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/tizawotufilileli.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/sofiliwopubododozuwikog.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/79503436859.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fuvixisozenigopu.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/nagojovonopikoma.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/72983661047.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/15282346962.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/353335504.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/51238949815.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/69950089798.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa8260bbfd---81099728491.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/9468581806.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/43835839866.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/winukapinozoxozaxasuru.pdfIn PDF document text
    • http://muszempilla.com/files/file/jilerazunubojinonanomex.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagila.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/40246607059.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mujorerevufalulemawoji.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161338e3e71faf---saboruxanolebadokaxufubal.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/37251200269.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/runexutamuteketan.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/47229455007.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/90498584059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=plex+apk+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_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 17860 bytes
SHA-256: 77eb57e2f28da8e2d8dab8218456633ed137e0664afead15b88dad7a68c98daf
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 10316 bytes
SHA-256: 6de35e28c6bb91f32600af6d565038b3c88283be8005d03585a6f8db1aa23d22
font_02_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1