Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce1cff74b6bbcb9…

MALICIOUS

PDF

93.5 KB Created: 2021-02-19 06:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb26bbe6e2ec9b92b0059daf347f8e51 SHA-1: c5278a26cc76d355c334936af4be3a02ce477889 SHA-256: 0ce1cff74b6bbcb979decc93031ecb9931d1fdefc5c42dd1fe4f59ce8190c36e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL leading to 'seumenha.ru' disguised as a search result for interview questions. This heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware delivery attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://seumenha.ru/123?utm_term=interview+questions+and+answers+for+computer+science+teachers+pdf PDF link annotation
    • https://cdn.sqhk.co/rijunawep/wgcMEHu/micon_x1_weather_icon_pack_free_download.pdfIn PDF document text
    • http://pavezala.iblogger.org/spreadsheet_sample_for_monthly_budget.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/nolenomavudewi.pdfIn PDF document text
    • https://niravewowinud.weebly.com/uploads/1/3/5/3/135343761/5943250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peregal.epizy.com/84696364098.pdfIn PDF document text
    • http://jegapedobip.epizy.com/consider_yourself_piano_sheet_music_free.pdfIn PDF document text
    • http://gidepajujida.rf.gd/alberta_works_income_support_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/22193928236.pdfIn PDF document text
    • http://pofabavulaxeli.rf.gd/windows_2012_certificate_template_not_showing_up.pdfIn PDF document text
    • http://fatesixinubumot.epizy.com/20510354620.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/minecraft_pe_0._15_0_apk_descargar.pdfIn PDF document text
    • http://bunurakugixopa.rf.gd/86867328972.pdfIn PDF document text
    • http://vawolanuxoreg.epizy.com/xemaxikosuz.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/xetunenutomedex.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_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 5580 bytes
SHA-256: 968cacc82f32c2a4f95fc25976444e0ea0f752d1ec01158ee9810f01e1e92bfd
font_01_sfnt_off0001423d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423D 11188 bytes
SHA-256: 9f6d8c83590c59d4dcd1ea032f05fd7bb2fa30ac35f20eba809938a85b8a1691

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