Malicious PDF — malware analysis report

Static analysis result for SHA-256 d310de90e5d475eb…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 20:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 222d7a50c304e8aa3bf5bfe7beb23672 SHA-1: a82b9d1c721a9ec69755e21561177d271b6275f7 SHA-256: d310de90e5d475ebaa1fbf328358e25b55fd7933af2cbb0682b3399c67694969
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or redirection mechanism for malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://milliondollardesiclub.com/upload_files/featured/files/noxovukunovoza.pdf In PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/muwavesiwan.pdfIn PDF document text
    • http://brukbet.com/user_images/file/85427094720.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/viwuzidoxo.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/93101573679.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/22529169862.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/84801023346.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/botobezewidede.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/danixi.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/garodafasadit.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cv9i7on5jhebahtl804kgqqeen/filetarejivexetobop.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b07e24326---86306724444.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kojub.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/43207649050.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/40293394569.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/7121992469.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/79970837005.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/zevetagepugamipowikipaj.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/betuguli.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/nujodozixefapejedejorax.pdfIn PDF document text
    • http://chayka-svg.ru/files/sabejikixagezewepupatovud.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/4035510603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=file+manager+apk+download+for+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/83733357697.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_off0000b10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 10728 bytes
SHA-256: 5cffa21acd8a09d2adda517f2c716263d105717302ac8cc84d4afe6423736ef8
font_02_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 14552 bytes
SHA-256: 2a34438d0a1d9fa506540447773a5618c8503cad4af0f61c7fb72df197300ff5

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