Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d3d442f9e445ad…

MALICIOUS

PDF

74.4 KB Created: 2021-06-01 04:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fa0239d65c2491a879ee52e0381c2402 SHA-1: 82de6593faff33ebfbf516ad0f32376b00649413 SHA-256: 73d3d442f9e445adb3280e62bb314b5223db271d121f1b15fdd0745920ce4ea3
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a common search query, suggesting a phishing or redirection attempt. The presence of embedded URLs indicates the document is designed to lead the user to external malicious content.

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://garglob.ru/pbw?utm_term=how+much+is+2+zone+bus+fare+nj+transit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424007/normal_5ff3ca4452126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381546/normal_5ff222426a2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_606e25acdbf24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_602be234e4db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_600ecaccc50b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5fee129fe909c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_60637b2552e14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_602de81b49f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_601ee3b7ae61b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_605e193ce8515.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421199/normal_60b5619644a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_606c4d4cbdbbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144440193/35933758335.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/55861045075.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/how_to_set_luxpro_thermostat_tx100e.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413532/can_i_file_my_own_separation_agreement_in_nc.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144439098/potutoxekipumedaz.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/veronika_decide_morir_descargar_completo.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/how_to_print_bank_statement_from_netspend.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_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 5540 bytes
SHA-256: 85ae2ff0242ba0361b13b7f4035447edb6205a8b717887d005da78a6f79c5cf9
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10284 bytes
SHA-256: e8a9e567e63c83f18560e4b358a40c3e9a2367d312a1cfb98eef60c54b60bf68

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