Malicious PDF — malware analysis report

Static analysis result for SHA-256 098443d28cc34d5d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 05:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5089319b6d528ebe4dbd11ae5a9eabd SHA-1: 12770269e37c9049d9b0310c8fe299d92e754d7f SHA-256: 098443d28cc34d5d11aedd52eaf888622d48461e289042f57aeeff28ec5bb41c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous disposable hosts and a redirector suggests an attempt to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and heuristics point towards a phishing or malware distribution lure, likely leveraging embedded links to external malicious content.

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 http://mulroyenvironmental.ie/userfiles/file/maburuzisijalinetikud.pdf In PDF document text
    • http://clingac.com/d/files/95249630473.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/damamenidenenafajem.pdfIn PDF document text
    • http://www.celso.org/download/67758436664.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/53402250246.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/nijasolab.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/4162208888.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/totedanorimowimas.pdfIn PDF document text
    • http://inica.org/files/file///75423736966.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/91364625480.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/doselub.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/jagitarab.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/50545368623.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vaked.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/39841669917.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5319d1237---58051415376.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/7643134491.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/rageboxewadusivikob.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/xetunubulupibamala.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kudotelugiv.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/6888597281.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/bedajosaluduwulaf.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/vesowelibixi.pdfIn PDF document text
    • http://zimmerei-possert.at/15401849041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=webcam+software+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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 10808 bytes
SHA-256: d9e7263efc56d91340bd68be0bee50eda559080287fd8cd9534ce5364d898bcd
font_01_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 17072 bytes
SHA-256: d519aa06189e7764e46e2bcdad68291944bf61fdb01e6c3aa7f29eef62855ee8
font_02_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1