Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c47f9135083b2f…

MALICIOUS

PDF

69.0 KB Created: 2021-02-22 06:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 76642251acb1a38d876d2b85a725da54 SHA-1: 6b6e6abcfdb887e9012f5319bc94c647cd596da3 SHA-256: 31c47f9135083b2fcae93659e329c25a35eea99d61af5e0acca20b6765d918e8
186 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or redirection attack.

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://baarspo.ru/strik?utm_term=the+house+of+the+spirits+isabel+allende+quotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475588/normal_5ffe26d3d5a39.pdfIn PDF document text
    • https://gesofomudejow.weebly.com/uploads/1/3/4/3/134344239/nenemoju.pdfIn PDF document text
    • http://qrettalq.online/pejujomokobebediwitijofmxi5m.pdfIn PDF document text
    • http://flymoney.net/zesinulineviv3mo25.pdfIn PDF document text
    • http://saudiautoinsurance.com/76344892411ny2xt.pdfIn PDF document text
    • https://leketupafap.weebly.com/uploads/1/3/4/5/134527175/nudenodetiperajexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_6013ef5a54531.pdfIn PDF document text
    • http://alex-chekalev.com/fast_crafting_guide_rs3qr7b0.pdfIn PDF document text
    • https://kigekasomek.weebly.com/uploads/1/3/4/5/134598498/4bf2022419e99f.pdfIn PDF document text
    • http://dle-tpl.site/13493704231vgj22.pdfIn PDF document text
    • http://topstop.site/gba_rom_hack_pokemon_glazedrr4or.pdfIn PDF document text
    • http://hookup666.site/langston_hughes_autobiography_bookmx29y.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/fovupawewun-jejisaxudinaj-pomulim-kilumoxatibox.pdfIn PDF document text
    • https://ranefegol.weebly.com/uploads/1/3/4/4/134498511/rojubojaka.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_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 5344 bytes
SHA-256: 0a0313a264f8240341c2eddbbd1a8b47ac969b2a4bbcf3d0cb468f3eb52fe7ba
font_01_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 10764 bytes
SHA-256: 3f4fa9a9e576db7e17b209614e95c0fa32a7661ebe150676f7079d34ad832505

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