Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d358d276a2d722…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 10:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 264761cdae28f1926eabfe309b1d19e9 SHA-1: 2a76547e4b10fd1f3bb23445efec7284e78fe24f SHA-256: 72d358d276a2d722e87e26f643a888140491832f8ebcc1e6cc850e66a29bace5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to link to numerous disposable hosts, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://digitalpolicycouncil.org/imagenes/file/91875084130.pdf In PDF document text
    • http://christopherdallo.com/file/loburetodexokazu.pdfIn PDF document text
    • https://eklyps.net/images/file/rufupuxakadepuniwosidotif.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/13322472073.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109112332371688.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/mefokur.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/ponibagigajidakimafusa.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/93817968725.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/zerokegu.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zozovitobisuzeziwo.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/vigovewafuwojuboturalazi.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/ruwar.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/87764120585.pdfIn PDF document text
    • https://geniodelweb.com/file/3907517120.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/80097832012.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/64024850668.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/28469989483.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/783681269.pdfIn PDF document text
    • http://upakuika.com/img/file/79491584253.pdfIn PDF document text
    • https://samudra99.com/contents/files/pubumenanefivof.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/81508970593.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/beduzotegapegotufaduwuru.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/bazelawuvunisote.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/43450272061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=retrieve+deleted+emails+android+phonePDF 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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 10768 bytes
SHA-256: fc9c8de056f16f5c7621744c7eb25446a2e9f93753a8cefd1f7b9d9736135a02
font_02_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 18080 bytes
SHA-256: 0069f9c671c2a8a7dbfb3fd69d7e2989e26dc6f5c535cc0537a0f2f4d0800023

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