Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28fa2594584c724…

MALICIOUS

PDF

75.3 KB Created: 2021-06-01 11:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 43626a9edf412ecc4571000ff947e1d8 SHA-1: b201539c4a7b45de02fbc7ffe4d2b074dcdb15d6 SHA-256: f28fa2594584c7243c6c1c57719dd74892d7cc8a5e66f3fd4c410d27ca377d70
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'medvor.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/pbw?utm_term=adding+and+subtracting+fractions+with+mixed+numbers+unlike+denominators PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450156/normal_60392890d4365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529780/normal_6007067354419.pdfIn PDF document text
    • https://vapukikavo.weebly.com/uploads/1/3/4/8/134886740/3641278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_605d83f32f670.pdfIn PDF document text
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/rajina-bofebixezakope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_601d921d85f8a.pdfIn PDF document text
    • https://waragiteket.weebly.com/uploads/1/3/4/0/134016771/5432264.pdfIn PDF document text
    • https://rinosebamajipem.weebly.com/uploads/1/3/4/6/134694393/774ea9eaf4.pdfIn PDF document text
    • https://gefilatokakanor.weebly.com/uploads/1/3/7/5/137501249/6724147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padimagofo.pbworks.com/f/how_to_make_a_minecraft_premium_account_for_free_2019.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144444069/nipuwogexojuno.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/wakukaditovobigogesex.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/durofaxadoro.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/94552463651.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144450612/labusaza.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/67984465250.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144439701/pearson_biology_textbook_10th_edition.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/f/nalemisanemebuzewefu.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/pupovovilugemubusol.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/f/casio_g_shock_tough_solar_multiband_6_manual.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/zikatukurerunedupesifop.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/jifadesebolorilexefawew.pdfIn PDF document text
    • http://xofitesu.pbworks.com/w/file/fetch/144447699/portfolio_templates_wordpress.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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 5788 bytes
SHA-256: b6a5e674f980c505de2bc74d1f5d01ee0c77cf01ebe204fb7d1911701f51ed88
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 11132 bytes
SHA-256: a0970371a44933bb415dec44c73471ce0a50169012cf4565fbcf5cfd3bb69dfe

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