Malicious PDF — malware analysis report

Static analysis result for SHA-256 a511120cdb0a981b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 20:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c9a2510b04fac54ae0da6f079c50cd2 SHA-1: 8f0f06fb4eb3a34c3a74109f8c327fac37876226 SHA-256: a511120cdb0a981b137c9db2f67565f27e72a037adf9d93023a22ff2f8538e98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ketchas.ru/uplcv?utm_term=latin+words+beginning+with+m PDF link annotation
    • https://floridainvestment.cz/files/file/wikililemumodipabar.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/gufolanujo.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/gamakikog.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109132251508130.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/todanurapupoma.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/93676220382.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/9890733279.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/sodegakumidunefawajisalu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xesalipuguwabuvixiduxuru.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/sudor.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/63398726340.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/dubojefejujotuwotelo.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vesuxure.pdfIn PDF document text
    • http://airsoft1.ro/files/file/49991378648.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631201113.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/dozavowazikiwatete.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/018a085f150fa6eb6755246939fd31d9/mobizosatimafol.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/34665448901.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/71257634713.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/kukizomazafulilegunib.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/gojofad.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/dasemoregemudivus.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/tuvuxotejobafoxuv.pdfIn PDF document text
    • 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_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 18308 bytes
SHA-256: 5742d09103f899262eec9734f71e2432a138857448e66fddd416ea53c3700e9a
font_02_sfnt_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 10832 bytes
SHA-256: 326c54708873124a39929e23d08fe3feb137f1085d5b5947e66b28a9472b1b7f

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