Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bf5c01bdf5ae71…

MALICIOUS

PDF

73.0 KB Created: 2021-01-24 04:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8232f9c9d69f484584fb4b7d58860fe8 SHA-1: 5138427ce90916c685f00bc5e4e3bd85a7fde5de SHA-256: 50bf5c01bdf5ae718c0ec3a1121b9ec699f105ed6db8d164de5419b3834c96ec
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=sounan+desu+ka+episode+8 In PDF document text
    • http://pusokum.66ghz.com/winrar_mien_phi.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/d7ieyhi/easy_2_pay_wallet_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/kdjdjcX/xutilomovivanifisekuma.pdfIn PDF document text
    • https://site-1176253.mozfiles.com/files/1176253/wutadinoxizipomuwosokev.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/ghgeDCF/24087251340.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/3IuRUyc/update_firmware_android_tv_box_m8s.pdfIn PDF document text
    • https://site-1166653.mozfiles.com/files/1166653/96954826588.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/pdf_para_aprender_ingles_desde_cero.pdfIn PDF document text
    • https://site-1198033.mozfiles.com/files/1198033/banville_the_sea.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/ihhjrPC/60062718223.pdfIn PDF document text
    • http://debodopox.iblogger.org/bentley_continental_gt_2005_manual.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/bipovoromoj/spotify_free_premium_for_pc.pdfIn PDF document text
    • http://viporikapopafep.epizy.com/bifixefanotajatowan.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/bissoy_answer_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/dijiduni.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/hollywood_reporter_daily_newsletter.pdfIn PDF document text
    • http://sefeluxezilire.epizy.com/vintage_boy_scout_uniform_pants.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/better_apartment_design_guidelines.pdfIn PDF document text
    • http://woxenebifa.rf.gd/35773776134.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_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 4272 bytes
SHA-256: 3609a60ed1222e361fd948a01f7d83fefefc9ba6c9415df97a218fc7dbe34cb7
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 5188 bytes
SHA-256: 3b891315d810662b841730dd3a65772d03f9abead91c255129783230cad5bc84
font_02_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 10168 bytes
SHA-256: 13dfb8ea3bd3bf12908f7ee9da6bc7fac6bd9936f032961e99011e05d7e61b65

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