Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae313bcf2715782…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 03:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b2d331f82eb8a3fd811ebc11b540e6f7 SHA-1: 06f742cef90db7a260ec65cd61f111160c5da0d4 SHA-256: fae313bcf27157825635789f2459d2b98756e0d7deae8235472431627868ed9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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 http://guides2alpes.org/uploads/file/vimajaxomogikumime.pdf In PDF document text
    • http://hoachattn.com/image/files/8816205472.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/68496091799.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/61594270133.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/jubolagozomumumorilonazaf.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/josavimulekemosir.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/romevut.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/metowajo.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/82137933096.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/pegarogujewi.pdfIn PDF document text
    • http://byecook.com/ckupload/files/29877911989.pdfIn PDF document text
    • http://firegallery.ru/img/upload/43966220977.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/28172224805.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1p3d3m4n9iniei60c6706h9l2p/wegasasifokawex.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/fotemelinawe.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/74383208989.pdfIn PDF document text
    • http://noithatvietsky.net/media/ftp/file/30143674213.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/wirobujipuligizoxam.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/74258386200.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/93543029818.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312691b8d98---makotizuwimemebovixeg.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/68661994049.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/34261807028.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/83164925145.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/9961532536.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/19585671717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=factory+reset+galaxy+tab+s3PDF 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_off0000b37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 10716 bytes
SHA-256: 86fc2d7a3c0f3d8fecc28980a6c3779a7f51d3bd7f0930ca13b72984e52075ab
font_01_sfnt_off0000cc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 14700 bytes
SHA-256: 878e91de3d97a2dec4ec51a437cbb7e5677ab099444156ef7abe6a4dccb7d114