Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3a731de75a406a…

MALICIOUS

PDF

74.1 KB Created: 2021-02-10 21:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6f21210d09a672520e7de2ff8a7694d6 SHA-1: 168d970cf5245e9d343a8432ce1ba12d4355f4aa SHA-256: bd3a731de75a406aecca5a2bcbbf9e78d0b6af0151579ffb51b9495598332b21
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://seumenha.ru/123?utm_term=tutorial+excel+2013 PDF link annotation
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/wizuviguv.pdfIn PDF document text
    • https://waxogisuges.weebly.com/uploads/1/3/0/7/130776632/1069426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_600c9865a281a.pdfIn PDF document text
    • http://gefaveje.22web.org/professional_resume_cv_template_for_graphic_designers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463306/normal_5fe4c43d81eff.pdfIn PDF document text
    • http://zenafek.iblogger.org/what_lies_beneath_hd_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370080/normal_5ff9887d07617.pdfIn PDF document text
    • http://xamawodub.22web.org/ammonia_compressor_working.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/gch1gdI/degonux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_60119bfc2ed6d.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/sagasijasisujol.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/wixamupelinere/play_store_apk_upload.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/junoximawuraxadofikuzo.pdfIn PDF document text
    • http://kuxiguzemafuj.rf.gd/rawijapimemajarut.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/29407982236.pdfIn PDF document text
    • http://neropexuzex.rf.gd/gelirazuxuvejibuge.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/free_html5_templates_ecommerce.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_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 5120 bytes
SHA-256: 5d444f004e875999cc25d28e91330d700f3c2c81028e16a198d1326fe37b7d59
font_01_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 11100 bytes
SHA-256: d419da9032d159f05bbd13984b354e831a526d0c1c9bc12e2a1325be13555a55

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