Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5898ec41fca5376…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 11:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 21f626c34fd6d5cffd33626e018cd10e SHA-1: a44fb6bc14fba4632f32c546feefaef8b14818ea SHA-256: d5898ec41fca537686fa0766d06dcfaf4da624fefe2c3c5e107c7a0aa577ccba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and the presence of many external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bayanairag.com/uploads/userfiles/files/wezuwenoxa.pdf In PDF document text
    • https://shreegroupco.com/userfiles/file/mituvirosufasamilalobewir.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/39020078945.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/balusilinemuzotodajodil.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/nozawokifudex.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/putigasetetuxogideba.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/wiwasi.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/91758391977.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/20719773086.pdfIn PDF document text
    • https://cian.hr/userfiles/file/rofuledixorokirasor.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cb43017746ae73164033dffc90b6eb7f/47118266126.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/91082681929.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/53362221873.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/bufuduvubovut.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6e6ceccb652b438ef82b1d4b91850821/siparusibezo.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/79188427408.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/79959456641.pdfIn PDF document text
    • https://grouptm2.com/contents/files/zifuno.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/74853628569.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109050600149875.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210908113525.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/18648195251.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/nawesotovebituwupu.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/52398574941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=all+star+tower+defense+codes+2020PDF 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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 10684 bytes
SHA-256: ffcaa7ca4f64ee00dfa32e84cd16ce3d265769065341a6eac6638a06acadf899
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 18180 bytes
SHA-256: 562c98a143720e5f23e710faf77f171c42bb57a43886e30bd239e6732ce79176
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1