Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4475093fb5ae27a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 18:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78b6897c39e39d1dee4d15d9d0a99110 SHA-1: 69db9f74f6f3c0eaab4262abdf9f9149236db7e3 SHA-256: d4475093fb5ae27abf2a55833d14ce3ede1deb0e77971c9281cef12f6b817f7d
134 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm on disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://smidgel.ru/uplcv?utm_term=the+human+figure+an+anatomy+for+artists+pdf PDF link annotation
    • https://rimi.sk/userfiles/file/40872018577.pdfIn PDF document text
    • http://erimti.com/userfiles/file/9656391809.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/58542380774.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/48034617947.pdfIn PDF document text
    • http://minerva-collection.net/files/files/19496754641.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/90273007859.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/66122978268.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/19890431705.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/76209241878.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6dc9c5909b3c6302063af63891a1384f/vanujisubu.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/396306191.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/31537098090.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109020848022163.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/boluvu.pdfIn PDF document text
    • http://indemo.pl/Image/files/bawed.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613344aa4ced9---tawekasulapofuwu.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/tepeliwu.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/puleluvizu.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/91053058916.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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16636 bytes
SHA-256: cbb2d6ef4e7f26bbbbcd9df418eea09f2214f5e7a4c67593cba930ba3fdd7f10
font_02_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 11076 bytes
SHA-256: 61ae723446640efa199259e3c2fdcfa4ae4577066a7d21692bee29799e164527

Open this report in the interactive analyzer, or submit your own file for analysis.