Malicious PDF — malware analysis report

Static analysis result for SHA-256 536d487a3ac6b7f0…

MALICIOUS

PDF

78.4 KB Created: 2021-02-16 17:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c9c710baad8697d369a62099a5684b61 SHA-1: 91819bb20ad776b9dc0b0bdbf2844152ddc70515 SHA-256: 536d487a3ac6b7f0670dab0b6e0e499852d4080a7f8051d8b5baf4d6674e17c2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external links points towards a tactic of SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=maths+riddles+with+answers+for+class+3 PDF link annotation
    • https://cdn.sqhk.co/safovokon/fTkZkHz/thoracic_surgery_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/clN1k9a/jifedidovaziziwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5fe2e61feba92.pdfIn PDF document text
    • https://miwunogix.weebly.com/uploads/1/3/2/8/132814940/9895733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450417/normal_60268810daacc.pdfIn PDF document text
    • https://bubafoxir.weebly.com/uploads/1/3/0/8/130874260/599757b4fe.pdfIn PDF document text
    • http://trylait.club/metformin_er_500_mg_diarrhea0e17c.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/gCDggje/niwarabefal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5fe17853f4048.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jiQhbha/fitbit_charge_3_setup_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/bByihui/dafub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5fcb980dc35c3.pdfIn PDF document text
    • http://4gusevshop.space/blank_7_continents_worksheet3m4ec.pdfIn PDF document text
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/gujakevabu-wajapiwi-busopolexur.pdfIn PDF document text
    • https://cdn.sqhk.co/zokoxirinuz/rtiejja/vebemaxotox.pdfIn PDF document text
    • http://idealicaitaly.site/relivasehk3lb.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/bI4b7gg/zojarodajinosinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_60184d287e107.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/igaUgfe/scent_of_a_woman_movie_clips.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/qlhchuA/xipuzatuvojepinaluluman.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5372 bytes
SHA-256: 40d376ddd6eb8bd18d8e4593e5b1918f614d6b9d7c6ecb6c70435f8c3ed24467
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 10888 bytes
SHA-256: 2139bc16e1b3f0e85dae6fa5dec8036f9ae7c3815c154a897ba6189a376f8c4a

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