Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc6797f50546742…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 05:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b46aabcc521f2cff32fc44f72bfc3ea2 SHA-1: 0f049951bb431ae0dad3a3a5ac82e2524b46f5ff SHA-256: ffc6797f505467421ee9e14c3fa33623fabacb8074f105fc004aaae789ec393d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are structured with UTM parameters, suggesting a phishing or traffic-distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drafthe.ru/uplcv?utm_term=most+purchased+phone+in+india PDF link annotation
    • http://bastola.org/userfiles/file/41460857867.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/bazixelireder.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/tepaxedufopurugajexug.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/56692178120.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/27616421852.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ddc18faf7c0cf83d855ae616cf25e520/vixonuvibom.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/43435140684.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/8602103572.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/90564692244.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/jojuxineredabasavefi.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/nezijawigerevag.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/22917379075.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/povefejedafis.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/gerolutonur.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/fexozelopax.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/81584797247.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/62953308560.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/kagidajigorigowatazoboz.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jerikotanisakavusa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e9c5460cb---60111507971.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/5692117021.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/kegitavopemifegum.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///65920277545.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/47900910515.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/37087396602.pdfIn PDF document text
    • http://nensi.si/upload/file/63745840343.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/wokowaxikevodokofagukabus.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_off0000b674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 10660 bytes
SHA-256: 4dcd9f513aa556ed2bfa39aa1cee5e28d32ba3d374f5c1f5c7c6afbc5f1b2cfe
font_02_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 15380 bytes
SHA-256: a7f5b34e7900207d7f6328a648a9a61dd69beafe79da8078b8c1e3511f592505