Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f0b1544150666c…

MALICIOUS

PDF

68.0 KB Created: 2021-03-03 09:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d12fbfd1457318479cfae69deeaec6ed SHA-1: bde67d6812c49474f1ce9fef37db3ff479c22805 SHA-256: 20f0b1544150666c0787bb86991fa3bafd0d8ebcf3cb6efa32a262a837361a90
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to a product manual, intended to trick users into clicking the malicious links.

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://druttle.ru/strik?utm_term=char+broil+tru+infrared+4+burner+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447276/normal_60184c36dfb5f.pdfIn PDF document text
    • http://tehnoprom.org/website_development_analysis_report_template2khmv.pdfIn PDF document text
    • http://my-favshopc.online/twisted_metal_2_pc4u3ji.pdfIn PDF document text
    • http://bridgecommerce.com/xebobozubebitugozovifepuskltio.pdfIn PDF document text
    • http://fresh-ita.space/25595996210sy6pg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_600bd6a677f6b.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/21326578238pmxny.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5ff8b701639d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fd34d4dd6118.pdfIn PDF document text
    • http://penageli.getenjoyment.net/paul_johnson_a_history_of_the_american_people.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/how_to_change_font_size_on_brother_p_touch_pt-70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5fce60a58ef33.pdfIn PDF document text
    • http://meetly.space/40586678440gr551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5ff8f7a55e849.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/university_of_colorado_denver_electrical_engineering_faculty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_6027ff817a13b.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/nalifij/discounted_cash_flow_valuation_excel_template.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_off0000ce34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 5104 bytes
SHA-256: 1caf77272a897257b14a4c8fc02c5af393dba2a9423ca32838ab62091cc48bd1
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 10568 bytes
SHA-256: 8bf113d5cba10249a38959b6aed9537556f436039966f97735b058827e123ee0

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