Malicious PDF — malware analysis report

Static analysis result for SHA-256 432f3098fd0377fd…

MALICIOUS

PDF

66.5 KB Created: 2021-02-21 14:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ee825bb11469a174fe7399bc16731d0b SHA-1: 5f3925284d3ef551481e0273b3bcd485afffe6c9 SHA-256: 432f3098fd0377fd52efd3e17cb2ff2ea492cdd761aa8eb9a47ab0601b660be7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=how+to+use+bissell+little+green+machine PDF link annotation
    • http://bighome.space/rekitobutu0a7rm.pdfIn PDF document text
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/nuxebi.pdfIn PDF document text
    • http://repair-foto.ru/takilizixofape4wbnm.pdfIn PDF document text
    • http://storeyou.store/vanguardias_artisticasihf57.pdfIn PDF document text
    • http://xewopixomimam.22web.org/fipufedi.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/gowimajemarezitexjn7r9.pdfIn PDF document text
    • https://jerofewu.weebly.com/uploads/1/3/4/3/134369167/zatomul.pdfIn PDF document text
    • http://shmelev.pro/31434232249rxibf.pdfIn PDF document text
    • http://test123test.xyz/goluboribosekinomr0o4.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/fibenabiwonepi9vz2.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/2238123.pdfIn PDF document text
    • http://hookup681.site/unity_2d_animation_packageah4mm.pdfIn PDF document text
    • http://milanomoda-italy.site/patras_bukhari_books_free_downloadab3i8.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/benubapopikaj/92531265350.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/hvac_inspection_report.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/foraxelokopurovimujetinum.pdfIn PDF document text
    • http://tosopipates.epizy.com/91601031822.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_off0000c93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 5408 bytes
SHA-256: d1bd0dbdf5b62f00e4b3658b73a59f5e620dc9da3bfcd92bf9b940cc8cc1a589
font_01_sfnt_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 9852 bytes
SHA-256: 81eb8a44e2a1a0c087b24562cc9f3ec6abc91b863c8f29aa80fbc803a5ad2659

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