Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef75bb95f73cfa3…

MALICIOUS

PDF

76.3 KB Created: 2021-02-21 10:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7158c38a6ba47b4c0e47b977cf7bdcde SHA-1: c5f09d60fb0dad1e77a1c11529663ad209d82c3d SHA-256: 1ef75bb95f73cfa3ffeae0b95375b48251143053a44d4c8832bc83bd1dc76039
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest this PDF is part of a link farm designed to redirect users to malicious content.

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://druttle.ru/strik?utm_term=game+of+thrones+season+6+full+movie+in+hindi+download+filmyzilla PDF link annotation
    • http://desepevadijowu.22web.org/vaguxudaseregeredaboxiwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5ff64c4fa1409.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/arenal_volcano_hot_springs_spat9e91.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/juxura.pdfIn PDF document text
    • https://ninisajata.weebly.com/uploads/1/3/4/8/134869212/37850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_602d243df2c16.pdfIn PDF document text
    • http://in-arenas.com/70436376494iqf10.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/ejjgche/93102098776.pdfIn PDF document text
    • http://zubiki.top/statistics_for_dummies_githubp1hm5.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/vofikelevo_kokaweludija_sazumasonuf_mudevad.pdfIn PDF document text
    • http://eslife.pro/antivirus_free_20192u1lo.pdfIn PDF document text
    • https://mujonuwamuvix.weebly.com/uploads/1/3/1/3/131383921/1558747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fe7028eb6245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gidibesuxi/template_for_home_expenses.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/popesivines.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/nekuromezelila.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 5520 bytes
SHA-256: e812f366588d26541cec10a2aec3e37a6d0b0aa8a5864aec4b30c6bc1fd3a85f
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10680 bytes
SHA-256: bf3f68706e70dd517ec596cc9777590a2ae94d647d6e9f0c0d82b9fb33716025
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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