Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e873fe429067d13…

MALICIOUS

PDF

66.7 KB Created: 2021-01-13 10:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f34fb851916f8e05bef2a141b62b7cc6 SHA-1: 72a0f78308daf21407b954f505de1d8de6ae990c SHA-256: 5e873fe429067d134fbe7e0015e6ab96ffa7d1c9c3351286dc1642fa1a06575f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document's structure and embedded links suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=washington+arbitration+and+mediation+service In PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/clicker_fred_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fe89091f0513.pdfIn PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/gofanagizojipukigorotugif.pdfIn PDF document text
    • https://site-1177585.mozfiles.com/files/1177585/pac_12_championship_game_score.pdfIn PDF document text
    • https://site-1225904.mozfiles.com/files/1225904/71825546332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5fbf583fddc7f.pdfIn PDF document text
    • https://site-1171149.mozfiles.com/files/1171149/bevekewunogukezififeta.pdfIn PDF document text
    • https://site-1194115.mozfiles.com/files/1194115/51650221096.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/wowonesoribu/wosezorupos.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/cakephp_3_github.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_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 5536 bytes
SHA-256: bf9ad0acf9a654aea7bf80f8dc458380686ad87d6223a5cabca4a9383b0a00de
font_01_sfnt_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10588 bytes
SHA-256: 0a5c7129d8f445a01527cdc06e751cd8bc321cfe6f61691e745dfef73e9f09fd

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