Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d0e7ea5d48501c…

MALICIOUS

PDF

75.5 KB Created: 2021-02-28 11:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9eb300727de465e2788509e0488579eb SHA-1: 7f343f6d6d0e91ae2e701ede9a682069e6effd9d SHA-256: 28d0e7ea5d48501ca40de5a08f31143cc595dc14b211f90dcf2b30e610c22c0b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to 'jacksth.ru', flagged as a potential phishing or malware distribution site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a malicious site.

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
  • 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://jacksth.ru/strik?utm_term=marlin+model+60+scope+ring+size PDF link annotation
    • http://dvigatel.guru/befotadovebikugebipah0fc.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/jaSjbXE/dimogosexixofebakagoduxa.pdfIn PDF document text
    • http://tublitalia.space/sample_motivation_letter_for_master_degree_in_marketing24g32.pdfIn PDF document text
    • http://accface.in/completed_d_d_character_sheetdq9t4.pdfIn PDF document text
    • http://exemplpusj.com/php_form_action_submit_button0lux7.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/eLjdCnb/mysterious_maze_cook_forest_pa.pdfIn PDF document text
    • http://matrixbicycles.com/how_to_file_a_claim_with_verizon_total_mobile_protection54xr0.pdfIn PDF document text
    • http://shopbest.online/35695229158bj6n7.pdfIn PDF document text
    • http://pokemonrivals.online/worolamaxisazakurasexur7na18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/39851191160.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/nutritional_information_brussel_sprouts_steamed.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/14636969989.pdfIn PDF document text
    • http://zizinamejukurep.rf.gd/calculus_bc_worksheet_on_differential_equations.pdfIn PDF document text
    • http://baduwujik.rf.gd/tubajebexeremup.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_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 5744 bytes
SHA-256: 8a371476cef19d143e9878959f039680b733ebc24d42db17ff31b0312bd118dd
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 10240 bytes
SHA-256: 5fb163a076a416b5491391ee4197586909c7c093e339aef2d7762496e423899c

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