Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5bd81b1d82b3ff…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 16:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a89ce275f18d2743f2d8b44f161fd367 SHA-1: dec93c2dc40487135046fc6d2da64eda3dd428f1 SHA-256: 9c5bd81b1d82b3ffcb3fdb2c6589de70619aa676972855bd43c145916733acb4
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. Heuristics indicate it functions as a link farm with numerous external URIs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://panoramabyty.cz/content/60483860085.pdf In PDF document text
    • http://savages.lu/imagesRTE/files/83844791486.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/ziwuvutejesofekuta.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/dexokatodavidefugu.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/85092656688.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kudete.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2ca98880---16218129503.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091019225140.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210902134552.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/50032871563.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/46269922677.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/supanosavi.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/nevuvunoperun.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/93977266342.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161394162286bd---gebagaraminoguzefudusiji.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/lanovowilatexanupov.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/1905041604.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/xonux.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/mojutudopuf.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/foxowimifa.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/nezifakuwivejokifubinosoz.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/ziwirozo.pdfIn PDF document text
    • https://educhina.mn/editor/files/50114301722.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/5590414478.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/nimobunavunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=clone+app+data+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_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 18400 bytes
SHA-256: 3d350e33be4c3270dc01ed32b113af41f54afac4de28187ef1d3486c53d45e88
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 10248 bytes
SHA-256: 7b503eabee33a111b84c32fb01900d12e5d2385b78723e381256ed9d7217f0e2