Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1094fb7598613e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 12:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4374c8777610edea7bab36015c3fa363 SHA-1: 26644d776543461457a2566eadb08f459695179e SHA-256: bc1094fb7598613e8ac7435886765a6ec962bbeb080ef669a80e117616d741bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL distribution point towards a malicious document designed to redirect users to potentially harmful sites.

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://huynhgiabaohotel.com/uploads/FCK/file/somaforukugesunonekixa.pdf In PDF document text
    • https://xyoaa.org/sites/default/files/files/tupiritigetiwit.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614030ee29417---12684030317.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/mezaw.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/kefotudosu.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/81778528763.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/48990024505.pdfIn PDF document text
    • http://pronobile.com/catalog/file/92787760692.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/juzugelavusonazox.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210912_5C8EFD52EDFE3597.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/77073385047.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/gonored.pdfIn PDF document text
    • https://makenie.com/upload/files/44769023953.pdfIn PDF document text
    • http://houselandia.ru/files/juwewoxigitomoderixi.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/71556046218.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0fb2aa9e8c19d9e51f8325f7d8870967/28411287277.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/seguwupasebitimozu.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/fuxijepipanudesugexapev.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/lexakevujijugujotekudunor.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/47406322015.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/11592050618.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/magapakim.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/56152493652.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/29935374109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=%2450+no+deposit+mobile+casino+australiaPDF 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_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 18592 bytes
SHA-256: c88e12610f6054f8f887bad6f9627ff9d2bb38320cbc4ccbb0ad721979dc5f9e
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 11284 bytes
SHA-256: 960047dbe22a0268bc6623d69df6f93befaa967d938386019aed8d07ed9a806f
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1