Malicious PDF — malware analysis report

Static analysis result for SHA-256 c861b39a411a93ad…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 23:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb10444e72dfc97e63722d4bb32b01c5 SHA-1: 2835224f243ebe3142d02be153b49a713a94d036 SHA-256: c861b39a411a93ad2115909e35e0b6e956b5b9bc8521cb38d23892f013759f33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=lulu+apk+download PDF link annotation
    • http://yevres.fr/ckfinder/userfiles/files/vuwulumepe.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/fibasi.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/lifuridumuwowe.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/75056903480.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/lasonuguzubipol.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/43723535048.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/vonesusevorebenarifuzono.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/31469878709.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/14803157676.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/787bb901804c5c8ba4b714c531943a7b/1867606381.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95177976541.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kumibekimapejifuvukuloji.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/83545861970.pdfIn PDF document text
    • https://aksusu.com/upload/files/14056116317.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/xowobirepo.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/51495721148.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/9443260501.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/61880984814.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/93560403035.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m8aqofm5l26t9eustretffqrqo/98223934309.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/8745994017.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/89467900704.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/kaxidosaxo.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/38235891236.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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 17776 bytes
SHA-256: 548e44e7a3efe08f51b498a1c05aa1640365581207f7dd44e1edf95c1c96f738
font_01_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 10032 bytes
SHA-256: 353e01a276ab61e6edb292b9b27dea4096900357cd142a0b546a094892c224ea