Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27561cafa870dc4…

MALICIOUS

PDF

69.6 KB Created: 2021-02-22 00:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: be89c20b7d001b6a8966d83225dfe1c1 SHA-1: db7072513cbb3f764b0e899d98e42e4bf81c05d4 SHA-256: c27561cafa870dc4782cb50146285aa237665b15c983ee2c95b25948e4985900
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'jacksth.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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://jacksth.ru/wix?keyword=yo+se+que+vive+mi+se%25C3%25B1or+letra+en+ingles PDF link annotation
    • http://pihodze.com/mogujitifetepako213c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481067/normal_5ff8df51e2e05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413005/normal_5fedffe35d0c8.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/8561292.pdfIn PDF document text
    • https://lojimosaxamigek.weebly.com/uploads/1/3/5/9/135976806/livaluzuw-mubemisataz-bujamazisibil-nusoti.pdfIn PDF document text
    • http://iqecoportal.ru/watch_inception_free_onlineggspi.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/vodiwopi.pdfIn PDF document text
    • https://joripirido.weebly.com/uploads/1/3/0/7/130776040/6547843.pdfIn PDF document text
    • https://cdn.sqhk.co/jumibizede/iajiihB/bridal_shoes_designs_in_sri_lanka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5feea05f4fbd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/41204108635.pdfIn PDF document text
    • http://sisawujeza.rf.gd/kudifimuzopaxolareju.pdfIn PDF document text
    • http://viwekamopib.rf.gd/antivirus_smadav_terbaru_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/wizard_of_legend_guide.pdfIn PDF document text
    • http://tuvakaj.epizy.com/pepog.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/epididymo-_orchitis_idsa_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/zezig.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_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 5364 bytes
SHA-256: 119cd04db664d015cfedbbcb52d981bb3dde45dd07df0f6f338cb145a8d637cb
font_01_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 11164 bytes
SHA-256: 2c48c326fb34d3b0de03c060fd4b9ba4d80f991121f9ecf0481e2825993fa6c3

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