Malicious PDF — malware analysis report

Static analysis result for SHA-256 8792bfbcbbeac435…

MALICIOUS

PDF

74.5 KB Created: 2021-03-02 01:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a3c8188ce48bebe6649b59a8090909fd SHA-1: 23840c4e63be2932b0452ea2eacdfa592b2af788 SHA-256: 8792bfbcbbeac435e25ac205596924be719e636871b657baedf5e313e9584da6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to disposable domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=instrument+to+measure+temperature In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_603c0c4107b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_6022dc097efca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_603138c78f134.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/successful_time_management_for_dummies_2nd_edition.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/escuelas_sistemas_y_corrientes_de_la_psicologa_contempornea.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/how_much_does_a_construction_manager_make_in_california.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/xadaje.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/96291814557.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/radio_shack_scanner_mods.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fdf4ac8e0038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5fea06e8928b1.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/15691455288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391649/normal_5ff4b5dc62f43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/does_the_heater_use_a_lot_of_electricity.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/28532815719.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/nufuwatogon.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 4868 bytes
SHA-256: 1fb8c6a27b1bb6fde5bc454f95101257c024aabc6366c38fd18f77f5fa376a85
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 11716 bytes
SHA-256: 0e13bd219fe37815cff9b61a787c15c02d0c4d0c39a53d93b7c307406c46a7e5

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