Malicious PDF — malware analysis report

Static analysis result for SHA-256 285d7dc39513de07…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 05:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1fed81a67ab12847301e14f554850e1e SHA-1: 249df7e38bed7b21e10f0419f49161557619732a SHA-256: 285d7dc39513de0726d72fef6715faa5d21b78f20621d321ffb50618deb74c73
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary external URI pointing to 'https://xajibur.ru/wix?keyword=bobcat+food+chain+example'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://xajibur.ru/wix?keyword=bobcat+food+chain+example PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403273/normal_5ffb7d06ddf72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5ff5ac15ee412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_60321dbcec494.pdfIn PDF document text
    • http://brumbum3.xyz/how_to_start_the_mantis_tilleruibug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_6035669b92d33.pdfIn PDF document text
    • http://onenature.space/bum_chiki_bum_bum_song_20177u5ar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_602465394b9c4.pdfIn PDF document text
    • http://zespodsvetkoy.site/59857429045wh0n0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408981/normal_5fce57d3a4b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_6033521c6a0fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigadibomo.rf.gd/les_miserables_movie_epilogue_lyrics.pdfIn PDF document text
    • http://totofexux.epizy.com/5218103184.pdfIn PDF document text
    • http://zilemugas.epizy.com/8015284336.pdfIn PDF document text
    • http://tinutun.epizy.com/lojudu.pdfIn PDF document text
    • http://lelekon.epizy.com/fozunexudevetemexezezaga.pdfIn PDF document text
    • http://fujebudavitasoz.epizy.com/37865344916.pdfIn PDF document text
    • http://lubuzasoxevixan.epizy.com/jinixetuwatifov.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/free_html5_templates_ecommerce.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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 5380 bytes
SHA-256: fe8aa48cf3ec93859107f3796c4406afeb3f0b20c072b35f4d90357aabf2e16a
font_01_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 10240 bytes
SHA-256: 905d3633b727c71dc41cf03178d1bfb43891027d3a11088b01329029cd8460d9

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