Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d5b3e6fe98310a…

MALICIOUS

PDF

80.6 KB Created: 2021-03-01 20:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 300ac4845d609ac4b520918c2523e16e SHA-1: b51a676b8150179db52a280c3ff221198abcd394 SHA-256: c5d5b3e6fe98310a52f92f8ecc8ad4f197cd2b675841543fb36a2475bfd31347
134 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'Urgency / deadline lure' heuristic further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/award?keyword=explain+the+effect+of+germination+%2528vs+non+germination%2529+on+pea+seed+respiration PDF link annotation
    • https://cdn.sqhk.co/romilononove/zggulg3/joxibubu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/J3gfiay/galaxy_live_wallpaper_for_android_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/igxsQyd/soxibidopulifekom.pdfIn PDF document text
    • https://bigubiforuse.weebly.com/uploads/1/3/5/3/135389938/6c85b243.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/94423946866.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/69066829459.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/3075836.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/860860.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/vijexasovex.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/fhaigij/fox_sport_online_liverpool_vs_flamengo.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/matlab_2018_download_size.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/clasificacin_de_cuentas_deudoras_y_acreedoras.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lefabeku.epizy.com/jogos_para_xbox_360_gratis.pdfIn PDF document text
    • http://jisufosesuku.epizy.com/grammar_land_librivox.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/zegugap.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/92413593748.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/60007009046.pdfIn PDF document text
    • http://sejabozewilobog.epizy.com/really_difficult_riddles_with_answers.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/frigidaire_ultra_quiet_1_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/90128807694.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_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 5808 bytes
SHA-256: 825d520c3a51ec6484c063c7d4e90007c4c6c0182d2f40809f336551692eda57
font_01_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 10740 bytes
SHA-256: 3a241cd856923f862256bc0e3d80606038baa5e5b98547d3216422f707261554

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