Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d859f7554cc31f…

MALICIOUS

PDF

94.7 KB Created: 2021-09-09 05:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 952d5ace6f124462b55115dd8cb77c9c SHA-1: 771ff7350c36943f51950e4ddd256a7ecd106851 SHA-256: 84d859f7554cc31fb7542385578b7595ca522b4a348aae79387fb3196af9f7e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a link farm with numerous external URIs, suggesting it is used for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630976392.pdf In PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/rarajunesarewakamilu.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/deputavuzuwa.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210901_14_55_59.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210902_E8EAF7E398F80719.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/it7qs5d94pdephrnlnk594r0t2/golafepogaduk.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/51155071028.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/vuwuwetedirulugu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/68371237562.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/37107745763.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/rujitolinemuzakano.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/ruxewusen.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/88050203255.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/bevugunukemo.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/95740184756.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/zitenobami.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/87020135063.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/zasuv.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/bemerikomubegedam.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/tijezaluzufijulopodet.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/49513971329.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/likowekemezat.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/86751988040.pdfIn PDF document text
    • http://davobio.com/upload/files/60720296219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=indian+constitution+official+languagePDF 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_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 10604 bytes
SHA-256: 0a979fefaecb49c87d50a5c58051bf651fbafd2d61f3d5e9cc57494b9328c33c
font_01_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 19236 bytes
SHA-256: 48dd7b8feeb1bc06ee916ee9d1b74fa38b4ad0133a4d7f476878c083b6c61b62
font_02_sfnt_off000154d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1