Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bea4fbe876d3ac9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 09:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9196b11c170f2b8a436defae960a0d42 SHA-1: d0c46e90908c49fa9b5534a795ef9c5c20c4ffca SHA-256: 2bea4fbe876d3ac944d3b1cf2a426880cdd580ec2cca09e2cd26ef0715eed779
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using numerous small PDFs on disposable hosting to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cokhilegia.com/upload/files/1490946369.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16147727c7bd6a---37945630113.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/lujerobavubumodojali.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/tivuzaxakisix.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/bupikimisafimujinegurefex.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///jusalagaxevapumoj.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/mugirukabosonewo.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/piwidumin.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/45214058108.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1631756216.pdfIn PDF document text
    • http://anpharma.net/upload/files/56188379702.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/63748146125.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/19075302362.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/lamozidusutagexo.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/rawejozajopajejofa.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909010242111697.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/49980780290.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zafezeredaxuji.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/nazoxiv.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/55707876116.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/xukagezalobutibezara.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/ralemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=stats+modeling+the+world+3rd+edition+answer+key+pdfPDF 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_off0000bdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBB 11484 bytes
SHA-256: 77351eeb4a0bb9d5e6f2b366737130b44e341a5aeef060354bede387b9948e15
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 17200 bytes
SHA-256: a083f30549d3c325e82c9038ea7cb211113124017d44d6f881a7270ace3b8af3
font_02_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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