Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd0b1bd5bc7ddb6…

MALICIOUS

PDF

67.7 KB Created: 2021-02-19 20:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dfc322a84b1160207928163efaa8c614 SHA-1: fd2954a78679be711df8f0d25ebdc2cbd7f81b23 SHA-256: dfd0b1bd5bc7ddb670193f4314d6141bb1fa67c6d4b1a961a9a4c28fa37007d9
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs that redirect to various domains, suggesting a phishing or malware distribution campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wb?keyword=john%20deere%20x320%20mulch%20plug PDF link annotation
    • https://cdn.sqhk.co/suzeboxiwo/2digGjj/xebebu.pdfIn PDF document text
    • http://zoomita.space/better_call_saul_episode_guide_season_1jkg5o.pdfIn PDF document text
    • http://ekzo-fruit.ru/xewogupokojawezame5zqts.pdfIn PDF document text
    • http://fullcreditreport.info/louis_berkhof_systematic_theology_freey2qa2.pdfIn PDF document text
    • http://menformula.xyz/norwegian_cruise_lines_stock_markety4cu4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5fee312e146ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_601a559be23b0.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/eBic1hj/kisunawobamesipibuluxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_6014653c58f85.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/jfNghjf/flow_free_bridges_online.pdfIn PDF document text
    • http://meetcabinets.xyz/vopanetizotavugox5hlo.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/toguvaju/minecraft_cracked_launcher_1._8_team_extreme.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/50243656035.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_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 5596 bytes
SHA-256: 9b5dbfd87839be6f68a45328873bf1f7a4bacc3a9f76576fdffa5278b17a7a85
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 9900 bytes
SHA-256: b7df0581367b547492d887fc5c9ebfab9b3a4f82be1c6e0108a5d1fc9b502213

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