Malicious PDF — malware analysis report

Static analysis result for SHA-256 13249da7f718102e…

MALICIOUS

PDF

78.5 KB Created: 2021-03-25 05:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7c47957e1c05436c366b56f13d7c6c4a SHA-1: e1e7d584a01c862c8e1f59ee045f770ed3156784 SHA-256: 13249da7f718102ed79081d24e9cd2d24dc5895b6c84df47330f74c8400206ed
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two, 'https://soxebez.ru/award?keyword=biofuel+production+from+plastic+waste+pdf' and 'http://kewisanoxiv.66ghz.com/recruiting_intake_meeting_template.pdf', appearing to be part of a link farm designed to direct users to potentially harmful content. The PDF structure and the presence of external URIs suggest a phishing or redirection attack vector.

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://soxebez.ru/award?keyword=biofuel+production+from+plastic+waste+pdf PDF link annotation
    • http://kewisanoxiv.66ghz.com/recruiting_intake_meeting_template.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/6geCicS/homemade_frosty_ice_cream_maker.pdfIn PDF document text
    • http://rent-nout.site/126964664136y4ax.pdfIn PDF document text
    • http://hookup671.site/731524945130w8f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_60279798e1d79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489247/normal_5ff927fa109f7.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/idjgpic/lituxubekalivufija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_60133a9e8e7f9.pdfIn PDF document text
    • http://samitap.iblogger.org/xovibusatafepas.pdfIn PDF document text
    • http://fomilexavekol.22web.org/canada_pension_early_retirement_forms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_5fdbbd33e5f11.pdfIn PDF document text
    • http://velasibab.iblogger.org/xavororurujamusugome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixabaxoji.epizy.com/51438964926.pdfIn PDF document text
    • http://ruberosorodoge.epizy.com/annual_report_powerpoint_template_free.pdfIn PDF document text
    • http://pevexuzuzuku.rf.gd/1998815080.pdfIn PDF document text
    • http://riwevanopa.epizy.com/5th_grade_science_worksheets.pdfIn PDF document text
    • http://jasigobup.epizy.com/asset_management_value_chain.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_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5444 bytes
SHA-256: 10bd3cfcccc8eccd94f57424a6c05df5a526c531015fbac764d019fd51e4c79c
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 11260 bytes
SHA-256: ee8c6be8dc491474a9fea16e1c390b59410d85e522ce8fd8fe2676f1d95c51b6

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