Malicious PDF — malware analysis report

Static analysis result for SHA-256 91adfaa03f7e4811…

MALICIOUS

PDF

89.2 KB Created: 2021-02-19 20:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ccc5b05cb4b2bdc0bd44d7cff7ae5c17 SHA-1: a851fb361d8b947ec9966fe37b5451ea375d866a SHA-256: 91adfaa03f7e4811bc375c2019f887a45e429f1dc1707d4a29d84694b07b9521
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 link farms, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to potentially harmful external 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://maypoin.ru/wix?keyword=horizontes+del+suelo+dibujo PDF link annotation
    • https://zudamuberul.weebly.com/uploads/1/3/4/8/134854759/kowapaginakomup_zopokixuso_baxed_vugudukikukav.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/eWgi6hb/material_girl_movie_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_601851eda1295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_601253cdb3b3b.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/jnnjbgg/rem_log_home_restoration_services_llc_of_colorado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_60171e5616de8.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/solafezolukadajulef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5ff3de5a449b6.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/Xkifgic/221540731.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/eeYgjLi/castaway_burbank_wedding_prices.pdfIn PDF document text
    • https://vimudizod.weebly.com/uploads/1/3/4/6/134632239/7453171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408878/normal_5fc865c5289ec.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/cIgfifU/uber_eats_group_order_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifiloxoburufi.rf.gd/equations_of_lines_worksheet_gina_wilson.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/dudenulimudew.pdfIn PDF document text
    • http://jukopiwiguf.rf.gd/badri_telugu_video_songs_free.pdfIn PDF document text
    • http://nutimuratibuzur.epizy.com/how_to_clean_bunn_slush_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/new_york_cond_nast_traveller_city_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/69029302589.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/convert_cm_to_inches_worksheet.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_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 4836 bytes
SHA-256: e56103973104970ccd8e54193192cceaa66ce99dcd846d858cd7094dea9e0d71
font_01_sfnt_off000132c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 11252 bytes
SHA-256: 2e191592381546c7198e427c7877ae02bab6ae80acc3441a990c46fc509252a5

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