Malicious PDF — malware analysis report

Static analysis result for SHA-256 599bf8d83e995466…

MALICIOUS

PDF

74.3 KB Created: 2021-10-06 03:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2993310b41d5d34e19bafebe9741e606 SHA-1: dc1f755ecf7d27db11f5254c2fb977cca0ed58b5 SHA-256: 599bf8d83e9954663da4c600063e664f5fab107bbcadba5bbae96e993609da8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://jeanmarcrobion.fr/userfiles/file/degopizarar.pdf In PDF document text
    • http://www.tivafa.hu/upload/file/nimuwabazaj.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/matuzozujorinoxik.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/lonawusinenoruvamixeb.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/dilagitopebew.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/rutitupevezilefagizewapox.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/magobazetidedejil.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/7245465464.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/lepepunovewapeligivosis.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091710365773499.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/xexux.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/80249314637.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/35523988104.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/33504497160.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/fosizilewogitowilorus.pdfIn PDF document text
    • http://novafish.it/userfiles/files/wisutixawobo.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xuzajofezetikedaz.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/6437273160.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/63537519936.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/391b9eab8534fb93376ebb367cbbe5c8/burejesumujujefa.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/l7hvgmb06oedrqvp3fcqj69mag/83276574025.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/fowexosoditadajivef.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/gixofabizibakagub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=food+and+beverage+cost+control+pptPDF 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_off0000bed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED8 10780 bytes
SHA-256: 18fbf8a7a0c4b1f6d465195fce384edfc3ab29d7c662dbc023eb1e1e99bd9fa3
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 17284 bytes
SHA-256: bb25f22994bbaadd5957ca67b0036af286da7e89347b6c444334d4c77609fad0