Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c447bdf3cae765…

MALICIOUS

PDF

70.6 KB Created: 2021-03-28 11:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 09c47fa179ddf8d1718efaf6f1edcca9 SHA-1: 50bdf904557448eb7c14373341512f8168e38619 SHA-256: f2c447bdf3cae76502f8c3ae9db6d3ef079cf0abfb9b8ed5cce444ae2de25091
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, contains keywords related to calendars and job resumes, indicating a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=calendrier+ligue+1+2020+et+2020+pdf PDF link annotation
    • http://profapp.pro/doxaweduxo33skd.pdfIn PDF document text
    • https://tolubezilonis.weebly.com/uploads/1/3/5/3/135348590/vukopelur.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/djjtMjg/pac_12_track_and_field_championships_2019_videos.pdfIn PDF document text
    • http://uaregroup.com/bank_teller_job_resumecdri5.pdfIn PDF document text
    • http://laulu-go.ru/diccionario_castellano_latinoamericanosq1mt.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/4Cjicgi/75598091199.pdfIn PDF document text
    • http://uscreditreport.info/5034721043580dx7.pdfIn PDF document text
    • http://ita-bio.space/linguagem_e_argumentao_juridica7019d.pdfIn PDF document text
    • http://epipog.com/76550898780tf1qk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5ffb3eb42d851.pdfIn PDF document text
    • https://mazabutefudoxuw.weebly.com/uploads/1/3/4/0/134017854/fesisomivemi.pdfIn PDF document text
    • http://thelait.pro/81637065921g53um.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/FBgdKjp/instagram_logo_white.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/2gxppZb/38031818740.pdfIn PDF document text
    • http://esmoney.site/glencoe_division_macmillan_mcgraw-hiqcaj5.pdfIn PDF document text
    • http://tersq.fun/127304199968u9x3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_60293269494ed.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a373ad3e-e712-426a-9b47-c0da29661d22/faniwesasumizazup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02d8e6a-00aa-4325-a0c9-ba6c6038a137/30293283151.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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 5260 bytes
SHA-256: ba4625c38521237e1743d5c0f8914e10166b3a8f5a9f2d21ec418a45cd0a305d
font_01_sfnt_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 11344 bytes
SHA-256: 788695bfaa819660b864ec527559754ac6e6f5823d1355bab4bf70ae6f933f21

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