Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd748f2821654c3b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 21:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0fb8ca4b57197bd1bd73341c5db7af5 SHA-1: d6b0bc335d047b67b0eb01a2ae9959142d4bb267 SHA-256: bd748f2821654c3bbd6bc70aa917e5ba0ac66955d827ab77373f79e7e1fdc370
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded links, many pointing to PDF files on potentially disposable domains, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://felicitareonline.ro/ckfinder/userfiles/files/dizosiroludekel.pdf In PDF document text
    • https://onecre.com/images/content/files/22897799363.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/febibosozadaxepe.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/41055888441.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/73556201255.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pilamuvapegagisaka.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/60557882783.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a088aa767---19998617286.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/wufoja.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/95409236015.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/69868152208.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/xununorujav.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/togazumevubovodi.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/nomatizeruzupup.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/31109307865.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210914094340.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/xapuzuvejul.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/80f293267b2ed1b66d6e97df56a71057/lovulaweduwibu.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/gebufiwasadawag.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/44408254383.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/levozilujipadezorisej.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/kitulojutomerefexe.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/dojuv.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/sisagok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mulan+movie+stream+onlinePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/pulewet.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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 10428 bytes
SHA-256: 7e8cb91e784ba14eedb2db38d54297301908dffaf1a6b919b1eb262b20040765
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 17076 bytes
SHA-256: ddcd5004dfb9ac11f7e2507a0ea370275c909d9c5360712fc45836ef6afe9b05
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1