Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f1da0df453c3de…

MALICIOUS

PDF

85.2 KB Created: 2021-09-24 07:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1c041d74ba9443bef7fac871af221dd SHA-1: 0bb67fd47685b016a5186aee7e1beef9e21a62e5 SHA-256: c8f1da0df453c3dea8368e7fbea953e2ab5594505f84eff7a2b8bd8193583397
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=fast+furious+9+movie+online PDF link annotation
    • http://acrclubinversores.com/files/galeria/files/2343725616.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/kavasavifoxejaxujon.pdfIn PDF document text
    • https://norservis.cz/files/files/juvorefikolesujusetivu.pdfIn PDF document text
    • http://zxsolar.com/d/files/tuzowekigirorofafigana.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/72673397353.pdfIn PDF document text
    • https://melz-feu.ru/upload/bemifapesu.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/83551722367.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/69635576142.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/pasaw.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/togim.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109040648035248.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/6790182120.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/bebirurutudemafaxebibo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143da3077e55---mugekexuzaki.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vewafesilegotarupufoz.pdfIn PDF document text
    • https://rm-parketi.si/uploads/73707638263.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/93896284647.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/12529148484.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/42649140271.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1632092817.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gusunifemamelarosezeg.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/vinojisujarokuxifi.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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 10684 bytes
SHA-256: f774001b5b4732983f708a35aa66a73f3ea59c2d6f5f78c9869cb076e9c9a006
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 17824 bytes
SHA-256: 6545d68dd5d3321f9be4f174f7a9da1b2087612f0e3daebb9f15e3e46b7794a7

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