Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4371887726b28d…

MALICIOUS

PDF

71.1 KB Created: 2021-02-23 11:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f6526a29a875152dc5c99cf4924490e8 SHA-1: 5301b7af3c76af36839930d0047bdd8a89ebe4c2 SHA-256: 6a4371887726b28dcc95cb5d80a5318a0196b8763be3982d992b19a22cd8a07e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'technical_analysis_course_online_coursera.pdf' in a URL suggests a lure to trick users into downloading a malicious file.

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://baarspo.ru/strik?utm_term=double+down+define PDF link annotation
    • http://leyloften.online/acrathane_if_data_sheetr06zl.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/rAge0Cb/56810258810.pdfIn PDF document text
    • http://shopsmmv.site/36479643601a3m0y.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/j7jccDN/golf_clash_clubs_tour_7.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/agjjjay/fake_call_log_app_download.pdfIn PDF document text
    • http://podipotekoi.ru/cheat_words_story3mcmb.pdfIn PDF document text
    • http://sellamorem.com/70714573468lpmz1.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/dhimTex/rewasofaritavifuwisok.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/hazieha/52728232197.pdfIn PDF document text
    • http://cetapp.xyz/23001298782inpfw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/technical_analysis_course_online_coursera.pdfIn PDF document text
    • http://fasesepazoko.epizy.com/tizonemenajidimiwalitona.pdfIn PDF document text
    • http://zezajezo.epizy.com/free_synonyms_worksheet_for_grade_5.pdfIn PDF document text
    • http://sudolurimav.epizy.com/zokigofewobuson.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/kegaro.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/97661649746.pdfIn PDF document text
    • http://fifumuwun.epizy.com/augmented_reality_game_apps_android.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/pdf_file_reader_pypdf2.pdfIn PDF document text
    • http://mevomum.epizy.com/devexpress_report_designer_pivot_grid.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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 4648 bytes
SHA-256: a9365cf8fe818ebd6ea292837430cf33f4902d02a650ff4f6a80f44c0612af3f
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 11536 bytes
SHA-256: 4214d43d23ba95af0260263e82d656a64db0be2f497d08f818c54a666e5ee9bb

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