Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84ad9d3668860e5…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 06:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ff6d3637ba6a45bbd232448a794d9f8 SHA-1: 604adb162030849993c846c50987c697ad69f31b SHA-256: c84ad9d3668860e56379bddfc128180ea754978cbed908a4cd7e07eb20f01666
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on potentially untrustworthy hosting. ClamAV detection and ML classification further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=ppsspp+apk+free PDF link annotation
    • http://salamatekhanevadeh.ir/ckeditor/files/files/79541033762.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/20524614857.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/91988721187.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/kimelopebaxajosatuzopap.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/89925164109.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4f11df31952b5310723ecbf420e3ebc5/dubapuwam.pdfIn PDF document text
    • http://futboltotal.net/images/files/54480402207.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/tubevedezevaximovafan.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/josolivirasolifisupaxoxi.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/xitebufabepuwobopulid.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/90802600096.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/83873853248.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/45769015210.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/farujotefodaluk.pdfIn PDF document text
    • http://ingore.cn/upload/files/dudalipokomipubag.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/kuliduvo.pdfIn PDF document text
    • https://khanikango.in/file/wedapukelolen.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/8640834664.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/67913706371.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wirakibidoxulelidefilo.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/70022875364.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/vozulon.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/09/fanuveziwuzud.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/digotugaxutodofe.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_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 17192 bytes
SHA-256: 0c40b2fb0992ca77b8ca0c10b93cd1727ffec03a30f63eab6d0c7f3b8e302119
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 9984 bytes
SHA-256: 0ec8a51343e031eb5dc458790ff9a4cf4bd1865d5780a7957335140b55f769d4