Malicious PDF — malware analysis report

Static analysis result for SHA-256 368076e7798a688b…

MALICIOUS

PDF

81.4 KB Created: 2021-04-27 19:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d5c65b5166ecbb2b60bf4e6985630515 SHA-1: 21094e806db6f8b976be957a367d4d3d18523a4a SHA-256: 368076e7798a688b50ae99e6ae1bd71f6bff108c363258c4a0dba11318dc8adf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM firing point to an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=diablo+iii+ultimate+evil+edition+ps4+gameplay PDF link annotation
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/5789554.pdfIn PDF document text
    • https://cdn.sqhk.co/penuvipaw/iahaBQJ/nojanijutadago.pdfIn PDF document text
    • http://teagreen.space/libros_quimica_general_gratisy99un.pdfIn PDF document text
    • https://ronunafo.weebly.com/uploads/1/3/1/8/131856498/gapisinaposat.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/jfC3iaU/hovercraft_takedown_mod_apk_1._5_7.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/hhbLd5D/gosivisasodaniluwivubuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ugccLhd/tuzagiwurukepikepagenolo.pdfIn PDF document text
    • http://stroy-level.ru/cortisone_injection_in_knee_cost_ukcpgfo.pdfIn PDF document text
    • http://salonapp.xyz/warhammer_40k_codex_8th_editionq2a17.pdfIn PDF document text
    • https://cdn.sqhk.co/vekunego/gjg0gda/aamc_mcat_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/fw21Sib/pivezip.pdfIn PDF document text
    • http://xteenware.online/7th_grade_additive_inverse_worksheett0oso.pdfIn PDF document text
    • https://joxejiduzimomad.weebly.com/uploads/1/3/1/3/131383973/5cc60ac12.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/2jiTpLg/vizularazadejin.pdfIn PDF document text
    • http://mbfsopg.com/how_to_open_maytag_maxima_washer43msj.pdfIn PDF document text
    • http://ag-management.space/poems_written_by_annie_johnson_flintswpcg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a12f753-347d-449b-8524-726be2dbbe69/computer_architecture_a_quantitative_approach_appendix_c_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50898a2e-9c25-461f-ab59-94471c4b5cab/86326520054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5d5a37-56c4-494f-8a18-8087dbe3a27e/what_is_considered_middle_class_income_in_florida.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_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 5572 bytes
SHA-256: 1ca020ab06ec59bd4f46250a4e25bc459066c8b9d5bf928fe7bde1ff4c2273fa
font_01_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 11500 bytes
SHA-256: afea1a5a596809ff40da584b9c1f67a1270ba8cc01e280d59003977a02081273