Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f1287a621d7abd…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 14:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a37fbbf12f7853d9d14479072ae18966 SHA-1: cf1e72dd4b74bb41d8ecb06d4e07d5b644a6f4d7 SHA-256: 05f1287a621d7abd5f0bd24d89e0be1f10ba5ca604c558e9268bff43e6a5904c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bibliotheque-des-arts.ch/ckfinder/userfiles/files/15008648471.pdf In PDF document text
    • http://lianbang123.com/uploads/files/202109301237095518.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/88708822200.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/22370059882.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/52879510796.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210921175006714135.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/bimixe.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37841741104.pdfIn PDF document text
    • http://4bx.pl/public/file/10147170254.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615679c48e16d---bowolajevibaxajumi.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jopevubuvidimadu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210905055529_1068605832.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/80843647965.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/redesu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16158f09d2f772---zosigewo.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/95833429419.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/32453541875.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/67458768817.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bosumutof.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/lebagamixuzakifunidadipoz.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/44589556583.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/jovisupalapifedavuv.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/14121546710.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/makagivuxisiroke.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/sapoxidamenumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=which+of+these+anchors+is+a+good+choice+for+recreational+boatsPDF 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_off0000b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 15616 bytes
SHA-256: cb134a187cca8b5dea4f24be8d516a38026cb6793bd54c1770c48fa95c45cf34
font_02_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 10888 bytes
SHA-256: f1b708f09f0e1329cf6e1a3c83a0b2db461eb946dd52e70f5cc3b79d9fa47ef7