Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46795d894472c0d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 16:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9d5fb85e833f7cdf07d4282ec1dc35b0 SHA-1: c83678828ee5fcbe81bb7f90df65ea9f64f4da27 SHA-256: e46795d894472c0d6bd8a9bcde8dd23142bf63034dee408229fa7a30e816353c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm designed to redirect users, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs point towards a common tactic of using malicious documents as initial entry points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=watch+greys+anatomy+season+17+online+free+123movies PDF link annotation
    • http://blueview.nl/app/webroot/files/userfiles/files/71121466198.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/64611204187.pdfIn PDF document text
    • http://htwy.com/upload/file/67572891803.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3cfc985a452b9aa5d0c6a93356763720/tavumusuzakuludozi.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109060930567443.pdfIn PDF document text
    • https://purefeeling8.com/data/file/gewelegelelilujidimedet.pdfIn PDF document text
    • http://bdata.vn/upload/files/15895330739.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/tedademek.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/tapizuxinodigusex.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/dokulaxugofetedojivi.pdfIn PDF document text
    • http://reylab.com/userfiles/file/xedoge.pdfIn PDF document text
    • https://premium-house.uz/images/file/81085227864.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/nuwawepatutugupafaliwojer.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/8266973574.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/bokesavujezuziw.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/fivonij.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/zelojibulazagenefa.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/gelebixenilug.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/79558688815.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/83732830181.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/vakamagujirevirej.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/xekof.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcca669094---32564236474.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/27393294033.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_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 11348 bytes
SHA-256: b6392ec233b141421954a97e969613115138132600563f191f2f645d1e17ea00
font_01_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 17052 bytes
SHA-256: ef28ee1bfdf92b6193829e21e963bb42e1b7fab95c3f6078585a2bc0b1cc5cbe