Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c08a6c647c2a20…

MALICIOUS

PDF

93.9 KB Created: 2021-06-08 07:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3d1a578ae5d94bed0b860c42b1e724c9 SHA-1: 0596da8a149c05914faaf732fab7d0625a36c151 SHA-256: 90c08a6c647c2a2057998c3659f7eff25430d4aedb891fcd9b368172a837d240
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://crysiq.ru/pbw?utm_term=what+is+meant+by+a+parallel+universe PDF link annotation
    • https://sixusiwof.weebly.com/uploads/1/3/1/4/131454093/tijeraremenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_603e4d339a0d5.pdfIn PDF document text
    • https://desalipi.weebly.com/uploads/1/3/2/6/132681317/retifoputifope_tewoxep.pdfIn PDF document text
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/649e6d0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5feb01cccb4af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_60bc2d4ec9226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405194/normal_60091b8e584eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_60288386b4e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6044764f24ce8.pdfIn PDF document text
    • https://luzusuzure.weebly.com/uploads/1/3/0/7/130775685/tesimedoxexujofibuve.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/kemejibu.pdfIn PDF document text
    • https://lovefuzabuzonif.weebly.com/uploads/1/3/4/1/134109130/vulenanavi_xijosurog_fenekegepalifim_fefizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tezalef.pbworks.com/f/i_am_offering_this_poem_comprehension_check_answers.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144456144/how_to_use_radiator_stop_leak.pdfIn PDF document text
    • http://masawumel.pbworks.com/f/glenn_greenwald_substack_price.pdfIn PDF document text
    • http://nugurafuge.pbworks.com/w/file/fetch/144520926/gunoribenovigabetuwufi.pdfIn PDF document text
    • http://niraxaba.pbworks.com/w/file/fetch/144788259/tubetakesisonexitu.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/50595993716.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_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 5376 bytes
SHA-256: f13c7c1d5152ae08049364e2b485f2a8192fd0512461e564c88c64fda2be1d7c
font_01_sfnt_off00014477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 11000 bytes
SHA-256: 3024d870f5fa89445c4dd6257b5116f86b32242b2187c24374ca61d9eca9be7d

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