Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ddcd6a19aa831d…

MALICIOUS

PDF

74.2 KB Created: 2021-04-15 18:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 74049e000f63c58de9fd45958598b97d SHA-1: de1167f4cf3e38d9734f362366f12ddd7e7dfd43 SHA-256: 23ddcd6a19aa831dee004281b4299c62fd6500c4d6ffe1100a14b2cb68854b46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/strik?utm_term=how+to+scan+pokemon+card PDF link annotation
    • http://vashobereg.com/the_biological_approach_in_psychology_meaning07y7p.pdfIn PDF document text
    • http://7lessons.space/sublimated_cheer_uniforms_australia3jw02.pdfIn PDF document text
    • http://stankoff.org/what_are_the_four_levels_of_reading1alea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_af9444cd62c84f9699f337594c1a1cec.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_adcd49d03ebe4748bb651981b8ed1926.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_a4032d3bed414c638e4caadad8d53b8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/hydraulic_grade_line_calculation_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/pz_binary_options_indicator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/waxesukawujurawa.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_b6f534e41b22466fa460ec3ba07ae410.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defujo/sutiteredenat.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_6db43a4f5ea04000bc1d41b0baf16e09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/basic_crochet_stitches_chart.pdfIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_f0917089fcd74173a02fc4f8a49320ea.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_a6b6f0ca54894731aab46686175bd561.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_767430a4a588445d88cbc70cd04df869.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/1989_ashrae_fundamentals_handbook.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_ebac3c9a78fb4d76a33413dbb0cb5ed6.pdf?index=trueIn 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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 5304 bytes
SHA-256: ae42d7215530989baa41f60ad2b6bf6ddba851d2a08b0b031b70e93301dfe588
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 11300 bytes
SHA-256: d8327fab10ed669f69bf3f76009a814a06603ca11801da8f67d55e038c6e1163

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