Malicious PDF — malware analysis report

Static analysis result for SHA-256 0384f8f79251fa9d…

MALICIOUS

PDF

78.3 KB Created: 2021-03-29 16:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c7e182b45de86dcdeb688eb5e90d2dd8 SHA-1: 18fdfcbf85e66c143a89c33b5fab1f5465e2ccb9 SHA-256: 0384f8f79251fa9d66abffd36816c0448ad2e0766f4331d0b1b4b1688a645f2f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=why+does+my+chest+hurt+when+i+look+up PDF link annotation
    • http://goromeo.club/hd_aquarium_screensaver_freevcpka.pdfIn PDF document text
    • http://everydayy.fun/bojekumoxopurapuzewanewirb90xa.pdfIn PDF document text
    • http://alcexpress3.xyz/562212247157wxqo.pdfIn PDF document text
    • http://stankoff.org/in_the_heart_of_the_sea_full_movie_in_hindi_dubbed_download_filmywapc0fq5.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/e6hejeJ/definition_of_ballad_stanza_literary_term.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/TdZM8gc/colon_and_semicolon_worksheets_free.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/iffbpih/13825859134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_a3a4632e7d054dd495810e24d4341a7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90abfe3f-9788-4991-b08f-1c2ed1b87d7f/free_piano_sheet_music_adele_someone_like_you.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_2471dab78ef54f34a50cfbaa8398b4c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51300393-4705-4437-8a62-8058a06b3907/how_much_does_an_average_car_mechanic_make_a_year.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_c881137bf2ef44299fdf7dbf0d300eca.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_5e11237a55fc4feaae545e8d28a51092.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd283da-53bb-4c49-b5c1-2ab11023a191/wapisibefivaretelamivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937a1ceb-a257-484f-a5a2-21e87196b750/jugegeg.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_1c9668f4971846c79acb73609d4c8814.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5372 bytes
SHA-256: f037ea921e06df6780260d5643000080bb8aac82da5f7b3e9ab70ffd404cbb8a
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 10576 bytes
SHA-256: 17e2df6b0e5e912b3121511db74ab75768723732cf03e3383349a5e7025592ea

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