Malicious PDF — malware analysis report

Static analysis result for SHA-256 758d7189a3022539…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 06:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4560c56956a19664dce4e5beca7a570a SHA-1: 58e441835c6952a24232ba550c8d931292cd7420 SHA-256: 758d7189a3022539fbf487711d2a6df91874339464074bcc3e3007a8831f659b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary attack pattern involves directing users to these external sites, which likely host phishing content or further malware. No scripts were extracted, but the presence of multiple external URIs suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pistant.ru/uplcv?utm_term=modded+agario+server PDF link annotation
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/gemujiruge.pdfIn PDF document text
    • https://clove7.com/userfiles/file/nasan.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/608106773.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/34267706830.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/wolalunupozosebotipibasi.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/tumefa.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/64956790055.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/jorasopavinijalezeg.pdfIn PDF document text
    • http://boldogelet.hu/media/13301684434.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/44623701278.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/kerod.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/061939508195.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/gapanuzaxomupifegexadivun.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/71435576490.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/55680235115.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fbd55716---norenitolikegox.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/90990684101.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/60720574610.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/83032275398.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/5001008743.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/51091159017.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5efea685---xuvonenobejejafor.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/fajedekefojegusab.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_off0000b9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AD 17776 bytes
SHA-256: b0a37bd55502c0298d66ae1d012c402a29dd55419f3d391c22af25135c6931a0
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 10236 bytes
SHA-256: 35c6bd64878b1d174772767678696dd5fe3caf0cbde4d3bb1bcdf3a34c053ca7
font_02_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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