Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcb70a4bc08e6ea…

MALICIOUS

PDF

96.7 KB Created: 2021-10-08 16:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d8fdf59ffa00637a9e5d515459a38d3 SHA-1: bb418f86336047412561ee4541468008305b4ee4 SHA-256: 2bcb70a4bc08e6eaa35e1b3cd2017155839308c1cd0c1a0d2c09c4e7b08cf2a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious activity, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://bannhuaduong.net/upload/files/92579714346.pdf In PDF document text
    • https://newsru.md/upload/userfiles/files/bejomipakuvomuzekoture.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/tujeloloxarejug.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/41139447665.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/sesejawumejudubikiwo.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/13016218298.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/govekafo.pdfIn PDF document text
    • http://sarvodurys.com/userfiles/file/61362460464.pdfIn PDF document text
    • http://mebco.ru/images/file/xeponotojopapileto.pdfIn PDF document text
    • https://fasaac.org/temp/files/95404422165.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/mipatupumivekipiv.pdfIn PDF document text
    • http://szpk.hu/_user/file/85747823648.pdfIn PDF document text
    • https://hse.tw/upload/file/92673905918.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/47067324189.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/89015980244.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/xujan.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2f8de1fb0ef1e2bee2d70a58df95706c/nibova.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/tazikalusawofoxefoma.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/sowupubuzedixizeve.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/40266757242.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/52742602814.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/wirekalivuvunawokeloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+might+the+spoils+system+cause+disputesPDF 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_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 11048 bytes
SHA-256: 33f9fa17df921f7a0917ddd6008ff25594eec414191924845e037cd0953056a7
font_01_sfnt_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 19144 bytes
SHA-256: 35fa5c879dd2477588976e2b1445d7206bbc09ff382f179c7c7cb09351f77d56
font_02_sfnt_off00015cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.