Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ba026503b7d4e9…

MALICIOUS

PDF

69.6 KB Created: 2021-03-29 07:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c5d51d0dcde3580918a3aaac34650f18 SHA-1: 48aec0896e30ee06e9251bb031d0834a72fde5cc SHA-256: 17ba026503b7d4e941f68d6a0829f7c2fda9937b57bf92e60f3efe70a0a58654
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to drive traffic to external sites.

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://jacksth.ru/strik?utm_term=simply+the+best+lyrics+noah+reid PDF link annotation
    • https://cdn.sqhk.co/lowanivari/libhdia/calendar_template_indesign_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_601840fd35f15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_6027608835952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_60103ff47cceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_605fa23759d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485703/normal_605fa0a9171b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_602c1d5036d6c.pdfIn PDF document text
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/8295817.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/r5zjbMJ/nebavokofolewozumazuwi.pdfIn PDF document text
    • https://golotarati.weebly.com/uploads/1/3/1/8/131856611/4501866.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/nenanibaxuf_sugazebip_jigix_majanifenop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5fd31cb878ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_602e6e12b8830.pdfIn PDF document text
    • https://defupodanujazi.weebly.com/uploads/1/3/5/3/135346118/9633f08fd37119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tanasebebibe.epizy.com/escape_room_answers_level_211.pdfIn PDF document text
    • http://videsukow.epizy.com/contoh_proposal_skripsi_akuntansi_manajemen.pdfIn PDF document text
    • http://rigawuseterozow.epizy.com/37730158740.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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 5656 bytes
SHA-256: 5a6a94f535a04525a643bf164820b5b72cc20a44550d45dc699ff5937b7e0d3d
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 10140 bytes
SHA-256: 76e6915e4ca22772cc8f992ba4cdb2e590107d4c1e69181bfbf5140956fd2ee0

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