Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4ee0240c55ab43…

MALICIOUS

PDF

79.0 KB Created: 2021-02-25 09:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 972132e15bed0e50e9864f6c5bd07c79 SHA-1: 707679a8c0a8755c177aea2781c1f72ce4a121b7 SHA-256: cd4ee0240c55ab43efb834618596ee73d120ec74c4ddc0016beebe90fe72d781
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the 'link farm' heuristic further support this, indicating the PDF is designed to redirect users to potentially harmful sites.

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://bologen.ru/award?keyword=factor+location+rating+method PDF link annotation
    • http://devgm.design/linksys_ea6500_manual_setupmzpok.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/how_long_have_prisons_been_around_uk.pdfIn PDF document text
    • http://unlockdeals.shop/pathfinder_bestiary_1_free5w56m.pdfIn PDF document text
    • http://help-violation.com/health_and_safety_diploma_courses_in_uaejxd43.pdfIn PDF document text
    • http://siankaanmexico.com/why_do_i_hate_my_job_so_much_reddit7voyj.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/multiplication_table_worksheets_for_grade_3.pdfIn PDF document text
    • http://theraisins.pro/area_and_perimeter_of_composite_shapes_worksheetjs12e.pdfIn PDF document text
    • http://instapresent.site/nomawaxit7bhs.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/how_to_fix_operating_system_not_found_try_disconnecting_any_drives.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/75036571056.pdfIn PDF document text
    • http://greatholl.com/caustic_3_app_for_androidvgj3f.pdfIn PDF document text
    • http://albatros-trans.ru/what_is_an_ethical_dilemma_in_nursingwn8pv.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/jifesu/fgdp_guidelines_antibiotics.pdfIn PDF document text
    • http://vutafinaragod.rf.gd/24593637675.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_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 5132 bytes
SHA-256: d824a21fad04614fe9a95d2e5ea31d1eaafebaa4176754b90ab7b5c23d825c44
font_01_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 10712 bytes
SHA-256: 1bdf2be33ca3c333ee61102d82d36379ee667149223ef1dc8078694f58070773

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