Malicious PDF — malware analysis report

Static analysis result for SHA-256 c374c16f55ece8c8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 04:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8db6e8e43bcf2161415857ad5c20e13f SHA-1: e3299f26710a1824b42e1e9a39ffa32005ff74f8 SHA-256: c374c16f55ece8c81a51e562cb1591601db14623e7707389f4ff924378ec7c7e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or scamming by directing users to a network of disposable sites. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://aeon-dev.com/uploads/files/202109212258053016.pdf In PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/2633308029.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/fasefaf.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/737de853c4513d93438da05164245f7b/korufanomodibibo.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/xaruwixo.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16324214494538.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/7844102234.pdfIn PDF document text
    • http://888chji.com/userfiles/files/8833056826.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/85773380405.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/gajuxu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zanenenabenovuvu.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/20747923487.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/12258138603.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/zukuzawimuvorusam.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/fixumazefapusetugitunig.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614321d94db12---59068446635.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/16301742927.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/podisemalefesesal.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/7346914835.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/patelusebusan.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vumimunajizexufeninovepa.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/23186940330.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/24453772300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=camtasia+studio+androidPDF 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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 15832 bytes
SHA-256: c2a2169fca8541e4e1fe75498b6cf4f626fe22ef000ccc8b9f2d76c4decedb4c
font_02_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 10360 bytes
SHA-256: c01c4b46ebaa4b12802f97e14967d5253d6218c9d900e59c47c2aa9dba12356d