Malicious PDF — malware analysis report

Static analysis result for SHA-256 528b7352d6831b45…

MALICIOUS

PDF

84.9 KB Created: 2021-03-03 11:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5f211f43bd237e5f0eeff1a433c80ebb SHA-1: b6b16e7cc0e66583c103495715a7ab2e0a32b082 SHA-256: 528b7352d6831b4528832480d866b2f595f409aa11dd737da56de88fb4f95354
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

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://vilenefex.ru/strik?utm_term=technical+drawing+definition+for+dummies PDF link annotation
    • https://cdn.sqhk.co/jigugabopu/ihnjfha/71937143518.pdfIn PDF document text
    • http://fesebenawasoz.iblogger.org/hobart_handler_140_mig_welder_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/3iguCOr/fekulewilogojekasixogof.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/ibpPjfh/dragon_simulator_3d_adventure_game.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipox/JiiG3ia/schema_electrique_moteur_monophase_220v.pdfIn PDF document text
    • http://domuxiwedazov.22web.org/ng_switch_template_angular_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/gjeBgg4/king_heron_greek_mythology.pdfIn PDF document text
    • http://gilatum.iblogger.org/kiteririnufosuvoman.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vabizofolimise.epizy.com/ravarogi.pdfIn PDF document text
    • http://pibimosozo.rf.gd/pidalumimawetutijujes.pdfIn PDF document text
    • http://lumulexidavotaj.epizy.com/47174512080.pdfIn PDF document text
    • http://demuremapinob.epizy.com/strategic_business_plan_example_template.pdfIn PDF document text
    • http://lewizalejeso.rf.gd/spectra_s1_vs_s2_vs_s9.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_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 5476 bytes
SHA-256: 47615975cd27705d28970d6ed3c052359628277a9df483cc4827f758de872f22
font_01_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 11072 bytes
SHA-256: 78fc77018cb5a6baf945035eb13406a59043ebf60a6bfabc2a4617a825eb641f

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