Malicious PDF — malware analysis report

Static analysis result for SHA-256 667c35366041377a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 09:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41832eb5453c87339b91381df85e827b SHA-1: 2216360c90d3126e45cb2ec358231af1ac5d0a1d SHA-256: 667c35366041377a71f2958ce8f71b71cd6f2dad5a9f00f5a62349f4ef677f12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a large number of external links, many pointing to potentially disposable domains, suggesting a phishing or link-farming attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://platypusspot.org/uploads/ckfinder/userfiles/files/josugotigupibanedenekefes.pdf In PDF document text
    • https://edouardweil.com/userfiles/file/lenixizuvatevofuwizafat.pdfIn PDF document text
    • https://termofriz.rs/files/15562469000.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/20253400421.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/13295181755.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/12901725726.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/wisetuxivimo.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/favorafedivojebusaxemiwu.pdfIn PDF document text
    • http://irinabailey.com/upload/files/19768716055.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/dubamuxopa.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/49007819445.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/76218425049.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8ee37ad03ee4d4511055cb70363161d0/94697895589.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210904234842994712l4a29f.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nutiwiduxuvitojexiv.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/reruzu.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lenumaku.pdfIn PDF document text
    • http://wuchem.com/upload/files/fegoboxanegepop.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/80571608611.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xuwob.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/velated.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/voxebatejim.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/pejipurodisemoked.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133adc5acd7d---degiwefimidugebojubakota.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/miwixifasis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=samsung+galaxy+tab+e+frp+bypass+toolPDF 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_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 11140 bytes
SHA-256: 5ebeddc4498302022ae04326e29f2ae7662114a454b12dc06eec6c1ad3ff1cf5
font_01_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 18252 bytes
SHA-256: b7b02b90118a65f80c6c507c9f1421e9ca0e89c7818e9eb81c8cac39b7493dd4