Malicious PDF — malware analysis report

Static analysis result for SHA-256 508d17bd032f15ae…

MALICIOUS

PDF

67.4 KB Created: 2021-03-13 13:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31df026b235767ae9d959b84e2b32eb5 SHA-1: c8da4cd05538032ab07507531d6817d380d529d9 SHA-256: 508d17bd032f15ae171ea7a666636b26487c205d06ab4647468c754026e1a0a8
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, 'https://kuzutuzo.ru/award?keyword=magisterium+livro+4+pdf+download', is flagged as suspicious and likely leads to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

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://kuzutuzo.ru/award?keyword=magisterium+livro+4+pdf+download PDF link annotation
    • https://zigikarorusoto.weebly.com/uploads/1/3/5/3/135351373/rumuk.pdfIn PDF document text
    • http://tibujodokerijer.22web.org/what_is_a_covid_secure_risk_assessment.pdfIn PDF document text
    • https://cdn.sqhk.co/wopeporamo/j5MijOg/senate_polls_map_fox.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/ifoL8EW/bukoborinuto.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/domukodidalakesasawa.pdfIn PDF document text
    • http://mawidoxejonej.iblogger.org/articles_of_confederation_vs_constitution_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dorowoz.rf.gd/perth_showbag_guide_2019.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_699420ca7783429397e4e6274dc554f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c78146c-bf70-4ea0-b111-3f48a1e82770/will_there_be_a_cirque_du_freak_2_movie.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_f4f59af2b30c40999efb4ac19f9aaadf.pdf?index=trueIn PDF document text
    • http://zofunumuwade.rf.gd/viguwadaxufum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3c26d6-0987-4d0c-9583-13b6bf7fc03f/wufanusekepivijidefegif.pdfIn PDF document text
    • http://tezixos.epizy.com/jifuwidaforulenadal.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/cellebrite_ufed_software.pdfIn PDF document text
    • http://komovuwe.rf.gd/what_is_adams_sin.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_off0000c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 5608 bytes
SHA-256: 02fc16925fbb9d50a57cb36cd8c0902df1847deaa58ae5fc7d788070a6f12834
font_01_sfnt_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 11920 bytes
SHA-256: 113f8e5cf56479b90601c028647979cc27d22f442b8e56757690a16fdf5fcc16

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