Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a2a23a628b932c…

MALICIOUS

PDF

74.9 KB Created: 2021-03-26 07:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 02fbe89ae0050d438ce35b5d14be682a SHA-1: 5db8f44b82c82b75bed14d3f39ae160e8d95f821 SHA-256: e8a2a23a628b932c25fb8afa1ddd01619420ffc0160130f1d74df57115064588
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/123?utm_term=toyota+avensis+manual+for+sale+in+kenya PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6015109c8bba0.pdfIn PDF document text
    • http://streamsweets.com/numeracy_skills_test_practice_freex52g0.pdfIn PDF document text
    • http://artistichomesolutions.com/los_tipos_de_archivos_de_publicaciones_digitales_ms_comunes_sonimn4v.pdfIn PDF document text
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/dematasetefi.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/lizigesodato-jidokavo-nekiganuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_601b8927e0e75.pdfIn PDF document text
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/aae1b18.pdfIn PDF document text
    • http://nutristrike-shop.ru/95990349161pdqi7.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/tawil.pdfIn PDF document text
    • https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/ropavuluvamokur_nolusolunuforo.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/799c5c5668c.pdfIn PDF document text
    • http://uscreditmonitoring.info/what_is_portfolio_in_project_managementv78f8.pdfIn PDF document text
    • http://wemuwugisenoro.iblogger.org/2003_ford_focus_battery_light_on.pdfIn PDF document text
    • http://indital.space/manual_de_sobrevivncia_escolar_do_ned_assistir_online_dublado_grtisfdsos.pdfIn PDF document text
    • https://vetedikagumon.weebly.com/uploads/1/3/1/4/131453784/5590100.pdfIn PDF document text
    • https://vodivabowadabi.weebly.com/uploads/1/3/4/8/134877230/ranivesogibib.pdfIn PDF document text
    • http://reawont.online/76960618297hzhdw.pdfIn PDF document text
    • https://neranoliva.weebly.com/uploads/1/3/4/2/134266014/3144373.pdfIn PDF document text
    • http://lexusesadedebaz.22web.org/timex_ironman_triathlon_watch_review.pdfIn PDF document text
    • http://vodoroding.info/84098569681qkymi.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/9160337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://binisufatifa.epizy.com/app_all_in_one_checker.pdfIn PDF document text
    • http://rozosijamuruxo.rf.gd/graphic_design_free_courses_reddit.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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 5088 bytes
SHA-256: 3b3673176c66afe5c5448acc44ed15b639687e6fbb08126bf9551e0842afaef9
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 10744 bytes
SHA-256: b4cd3ce50fe11664fcf9ab5ca198a115dbf78681f4270a0020fb9883550162c1