Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db8f2f748501d17…

MALICIOUS

PDF

82.8 KB Created: 2021-03-03 07:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8ea739601935ea37cb0edc65bffae06a SHA-1: 885a2740d7edc7b39442dafe59bb74e588de46f0 SHA-256: 8db8f2f748501d17a803bffebfcb2f9bc7722d8ba046f0be6427482bcb5750d3
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 hosting, and is flagged by heuristics as a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

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://bologen.ru/strik?utm_term=olympus+om+10+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fdc40ba68ede.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/im_ok_youre_ok_summary.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/dejonakanuvopinumeloje.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/zWhbjac/nuxojumosavesok.pdfIn PDF document text
    • http://niludop.22web.org/nature_s_answer_periobrite_alcohol-_free_mouthwash.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/icuocLQ/vovubedonexenofizivutinuf.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/jdjjjel/the_burger_shop_menu_hereford.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/best_cloud_computing_stocks_2020_in_india.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/94721050587.pdfIn PDF document text
    • http://atlas-copco.su/furulisizugejaxani7nihz.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/kitof.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/como_aprender_ingles_con_canciones_gratis.pdfIn PDF document text
    • http://shoplus.info/bumoxujafarv5no7.pdfIn PDF document text
    • http://yildirimotobursa.com/cuanto_mide_1_metro_cuadradoy3yz5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vunibem.epizy.com/30905636355.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/rawagukifovexajiduv.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_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 5044 bytes
SHA-256: 1be51ef21c1976348021f7ad88255cdb9196958daea72dcad0fa4e149994d491
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 10940 bytes
SHA-256: 7e5359d2496e564627ece31c574ce0d069b425dea9645a1a9772c8a1ac43be0e
font_02_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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