Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2af32afda290335…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 10:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2674746af860c36b346b1c676df26d63 SHA-1: 12a45682e31157a47951cab7795c98ceff5ba725 SHA-256: a2af32afda2903350b4117810fdb16b0a72b72595a0c7af051bf5556fca1848a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://lumieye.com/userData/ebizro_board/file/467830683.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/56b08ff5772bc970811089fc55889c7a/38409871687.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/9496294972.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/54764727421.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613375fa15464---72572001742.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/57963816100.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/sajobufoxupe.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/98030596476.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/96513321377.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/zuzabasiboxaxanukam.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/9528541833.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/wujapobexaji.pdfIn PDF document text
    • http://minipit.com/data/files/vevime.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/40016543244.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/buboxevukibuvifakuburosut.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/zozonitomo.pdfIn PDF document text
    • http://labradory.pl/file/motelikisutinibewetelo.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/22934684176.pdfIn PDF document text
    • http://salt17.com/userfiles/files/lorevuzokefovebukojudu.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/15242711973.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/7540119878.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/gilexibagav.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/rugumeve.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/47038667972.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/zuziragudafixorekokefoz.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/56726373409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=1611+king+james+bible+first+edition+pdf+free+downloadPDF 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_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 18156 bytes
SHA-256: 4cc7be1b31149d0e592bb770387a8165c56cd1c38b714afafe51b73382ea2392
font_01_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 11412 bytes
SHA-256: 6be62fda0216862b54496a5bec639958ca2d8bb139fb9a7c2fab4cf5703f2215