Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c8323518d07cc6…

MALICIOUS

PDF

74.7 KB Created: 2021-01-26 12:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e83d7a5d68c92352c65656fb76380e1e SHA-1: a4a4bdfbedeb732df7ca7eb6ca0518f8af3d0965 SHA-256: f6c8323518d07cc6c0c8a165d1e3699d0bb6894545941ead8e5004cbf443192e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a malicious redirector and a link farm, pointing to suspicious domains. Notably, it includes a 'Clipboard command execution lure' heuristic, suggesting the document instructs users to copy and paste content into a shell, a common technique for downloading and executing further malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://traffmen.ru/aws?utm_term=captive+portal+for+android+hotspot In PDF document text
    • http://reduslim-italiaofficial.site/sewigadogazoriio9ir.pdfIn PDF document text
    • http://robertferrell.net/slide_away_oasisdgfm9.pdfIn PDF document text
    • http://abouts.space/nabanesivek12su.pdfIn PDF document text
    • http://baugroup.info/panomuxeduzinisumisax4fj7v.pdfIn PDF document text
    • http://joteruzawareba.iblogger.org/instagram_video_er_online_free.pdfIn PDF document text
    • http://fortuneocredit.com/531582254445a37x.pdfIn PDF document text
    • http://robolab.one/highwaymen_movie_dvdw753l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://galikamot.epizy.com/cycling_jersey_template_ai.pdfIn PDF document text
    • http://tudutov.rf.gd/jogo_coelho_sabido.pdfIn PDF document text
    • http://tuwidapaj.epizy.com/chromebook_3120_android.pdfIn PDF document text
    • http://patabajisof.epizy.com/93075114436.pdfIn PDF document text
    • http://dawivek.rf.gd/a_filmywap_marathi_movie.pdfIn PDF document text
    • http://zovewopot.epizy.com/vabobaxemikemeru.pdfIn PDF document text
    • http://bologipegokofi.epizy.com/texuvemi.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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5096 bytes
SHA-256: 6b76140a6e74baedba7fa9aac6647ef9dfeb6692e093daa51e97a7e73d47b296
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 11900 bytes
SHA-256: d3f8a8c8f850fa89dd8735774d351ccd8231e1f0a19481054769033d1a21b4ba

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