Malicious PDF — malware analysis report

Static analysis result for SHA-256 928d00583ce555fe…

MALICIOUS

PDF

88.1 KB Created: 2021-03-01 20:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 48bb4d1e77cb1badda3c8c1cf310b71b SHA-1: 635295b98fb20804b2cffa774add3dd98e9076ef SHA-256: 928d00583ce555fe415500fac65027334ce3f158ebd64be3bf00cec83a728c04
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards malicious intent.

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://xajibur.ru/strik?utm_term=how+to+stop+air+conditioner+from+leaking+inside PDF link annotation
    • https://pedamajemekiju.weebly.com/uploads/1/3/1/3/131380885/risuvupuduzu.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/a929b.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/ehiegh5/72604005580.pdfIn PDF document text
    • https://cdn.sqhk.co/ketofebem/Qnc7Ugj/play_charades_online_with_drawing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_600de549ba4ba.pdfIn PDF document text
    • https://bozuluxowefag.weebly.com/uploads/1/3/5/3/135349757/zusevufifed.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/Cigjbjp/electric_guitars_for_sale_northern_ireland.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/bThd2hh/godus_wars_gameplay.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/rukonivudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://romezegipoxo.epizy.com/megan_fox_age_transformers.pdfIn PDF document text
    • http://wupotatide.rf.gd/hostgator_wordpress_admin_login_not_working.pdfIn PDF document text
    • http://jujeludapivibiw.rf.gd/arrow_learning_by_doing.pdfIn PDF document text
    • http://jobiduleger.epizy.com/standard_5052_aluminum_sheet_thickness.pdfIn PDF document text
    • http://wifekukoxigax.epizy.com/varinupuzaxonifiro.pdfIn PDF document text
    • http://vabojiseg.epizy.com/wedding_march_instrumental.pdfIn PDF document text
    • http://timarerovasezot.epizy.com/advanced_abstract_algebra.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 5380 bytes
SHA-256: 02892b34600b6a812c5dc648bfd5d44891748ba8728bb4e17b0c3d904b263305
font_01_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 11820 bytes
SHA-256: 736ddaf717224e1750a507640a7f0b69f849fa1ee9484eda36045f8c138776ae
font_02_sfnt_off0001454a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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