Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbfb5476ef58e0d…

MALICIOUS

PDF

70.5 KB Created: 2021-02-20 13:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 4e5c9b12ee550a100ea276e0dd397a4b SHA-1: 4251b74ddbb5e4f43c79c1fbfada47ba3e9e6d99 SHA-256: 4cbfb5476ef58e0d83bc6836f9a532a43520d35ca812ae8c0620592d83f526be
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by heuristics as a link farm and a potential phishing document. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=dyson+dc41+parts+amazon PDF link annotation
    • https://cdn.sqhk.co/kagalitisup/uMWqrhc/zisefobokudufoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5fe8fbf3452bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5fc9c1e94cf60.pdfIn PDF document text
    • http://sizegivip.22web.org/fupekonenavitif.pdfIn PDF document text
    • https://cdn.sqhk.co/tadawatimi/cCiefha/tho_nguy_n_family_channel_tv_shows.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/qdAjjcx/10999310656.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/hishcOE/68551010004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tidefos.epizy.com/56995931164.pdfIn PDF document text
    • http://xafedanurene.rf.gd/zefelonukewexajajatutaka.pdfIn PDF document text
    • http://fuzezufomazo.rf.gd/telilisolonolibavudes.pdfIn PDF document text
    • http://zusirana.rf.gd/wabatezed.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/cake_i_will_survive_trumpet_sheet_music.pdfIn PDF document text
    • http://joveteki.epizy.com/pollo_loco_500_calorie_menu.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_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 5476 bytes
SHA-256: 624d64be42789d50ac11d80aa6a80d96c51e3f4353a09e550d1a84a345643479
font_01_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 11804 bytes
SHA-256: 1e28833d8f7e6732ef121b7db1ca4240848749ffcfaa5c6232ac24de14c3c372

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