Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b2f68d7b578466…

MALICIOUS

PDF

80.9 KB Created: 2021-02-14 15:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e2087d05a9d4679280649e07c37a3e80 SHA-1: 5b9f8f6864aeccfe3c8ca146c023a658a396c12e SHA-256: 85b2f68d7b578466e6204304c6940736755e1f31c65b925350a1d5a058ca2d9f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=best+linux+distro+for+android+programming PDF link annotation
    • https://cdn.sqhk.co/wemonamo/8Ggihhf/9400577310.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/forest_twenty_one_pilots_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5fe3a8964964a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5fcaeade6882e.pdfIn PDF document text
    • http://boxidodo.22web.org/zakenokanalikugeb.pdfIn PDF document text
    • http://sajitalunaded.22web.org/532149934.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/iichdLy/weekends_only_jobs_st_louis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484610/normal_60027cd013f2f.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/hejihgS/balance_ball_3d_game_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457561/normal_60135cff47504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupumimegijema.epizy.com/modern_cv_template_latex.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/91953195285.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/88010878540.pdfIn PDF document text
    • http://dasupepu.epizy.com/cribriform_plate_anatomy_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/love_story_piano_sheet_music_free_printable.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/uma_new_odia_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/fafufibujumonaw.pdfIn PDF document text
    • http://satonavuka.rf.gd/28881205078.pdfIn PDF document text
    • http://soxomidil.epizy.com/ketunezimabapi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 2900 bytes
SHA-256: 5226c763f3d4f3cbceb38bcb13217c6b3d4a8982263ccab1e51df51dbcfe70e9
font_01_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 5480 bytes
SHA-256: 2ba4cf05b56bbf48eee7c534abab9109d265182debd77cc1883e1af664bc242b
font_02_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 10632 bytes
SHA-256: 58ad13aab0a1774d5741788a326b1e1de5425ab8eb070d2c096e7c8d823e9fb4

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