Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e968980995f3af…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 06:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85c0e883d4899d2801166432a6959742 SHA-1: 275e8a225134c4b9dbec035596d5ad8f9eda44d7 SHA-256: 09e968980995f3af4d7ed6f40c322a6f66cbe787543b56b824be4dc03f1447ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with many pointing to disposable or unknown domains, characteristic of a link farm used to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true destination or to host a large number of redirectors. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sieuthivatlieuhoanthien.com/upload/files/jowaru.pdf In PDF document text
    • http://dade666.com/userfiles/202109file/2021091110483270554.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/15894471574.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302aaec70ea---zotuminebamavinezu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/98819416047.pdfIn PDF document text
    • https://cape-electronics.com/media/file/depafagipelex.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/koraguwarufotamo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/36415722999.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/66073871841.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/75033543221.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/83460946069.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/sareroduxul.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/50042788918.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c96fa0e507522535983df06ecadb710d/jifixeviweresu.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/29425522861.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/gudenobosudoxumegudenixuv.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/24712439694.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/36341757549.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/49440767288.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/29755603010.pdfIn PDF document text
    • https://questyme.com/userfiles/file/68377557437.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/botisuza.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/10956099725.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/8901691597.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zegejet.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/jemamotezetovexoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ftc+android+studioPDF 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_off0000bca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 10260 bytes
SHA-256: 97fc243d852d93a1bbb029e847f4b8451f36588a12abd641ad5c7752406c8674
font_02_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 17224 bytes
SHA-256: 2decc694e1bd1ae920a32fca9d7620b72ac18698e8169c11b162b0aa8eb9260d