Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec676c126f2e6162…

MALICIOUS

PDF

83.0 KB Created: 2021-03-19 10:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f5d8e1e586f46805e0225a6e094dc3ce SHA-1: 3e3fa46d7f7265f7631af5cac9cb7c28d16820fe SHA-256: ec676c126f2e6162e5aa416a39b221de6b97c8630a1b914a13ed7d83443c2f67
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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=fire+and+blood+synopsis+book PDF link annotation
    • https://cdn.sqhk.co/busibelifiv/GhgfjhE/xafovujogimu.pdfIn PDF document text
    • https://cdn.sqhk.co/nilajinipur/Tz3ibha/top_trending_hashtags_this_week.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/Hgiibji/douglas_county_oregon_police_scanner_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/hcUihcM/30048282934.pdfIn PDF document text
    • https://cdn.sqhk.co/fibafape/xIpggjg/21122178126.pdfIn PDF document text
    • http://gimarokonul.22web.org/articles_of_confederation_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/KaQQmgi/29805813791.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/ihrSWjh/61250240703.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/gjdjihb/download_music_equalizer_for_pc_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavuveba.epizy.com/13089528825.pdfIn PDF document text
    • http://gotuziput.epizy.com/xalewalegomelevulorewo.pdfIn PDF document text
    • http://biwedudomobi.epizy.com/cadence_allegro_user_manual.pdfIn PDF document text
    • http://gevewodex.epizy.com/tajuduvuzazogelopivedor.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/thermal_insulators_and_conductors_worksheet.pdfIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_2e1570efbdce401c93b005a7ba478849.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_1baf5c2f1e174021b99a3ed629a6298f.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_cb41389b75614a308b9a0fbecf67f9b9.pdf?index=trueIn 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_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 5212 bytes
SHA-256: e656db40ed85081f8a9e345777af9239de7959501a9027d1f0498c88df823d8d
font_01_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 11272 bytes
SHA-256: 7af487aeed610db7ca4ce2e0c0ab2da741f30e083f2d46b37a7c7942e03a2155

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