Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c50f4470d8ddf3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 15:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ec49ae78edf97397ba3b95ccb7e587c SHA-1: adaafeeddefc5f7b8f491f6562b7647b78792eb0 SHA-256: b0c50f4470d8ddf340b0a2ada0f980aca88cf23c2d36f279892b035f00820b49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or content distribution scheme. The PDF structure itself is also noted as potentially being a link farm, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=resultat+brevet+2019+guinee+conakry+pdf PDF link annotation
    • http://leeandrewdavison.com/download/52482793303.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nawikinovujekiduteb.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/tiwugafa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613655f47378f---26436755374.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/dumitoxuwak.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/pemim.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/69870881384.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/gogafugibope.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/doxuzoz.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dipitakijibasevufikabiwa.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/564861636481630975818.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/12555316106.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/japazovegisozoderemivatat.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/fopexozewuvoxuv.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090716110724.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/47629305195.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/57942710857.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/90296084229.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/futunexubopunolatagobuti.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/vokelaledujesivi.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/75751762713.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/dabukojodupatonawotap.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_off0000ba84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 17396 bytes
SHA-256: 7646834b363c31966a31276e2a0a684127598e5fd7134a8b0650394b3dcc5128
font_02_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 11816 bytes
SHA-256: 79455b3daf87f82c97ea8ae9b18cce811d085c8c76135015863cde965ef9958d