Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da3ae834f9aae2c…

MALICIOUS

PDF

83.6 KB Created: 2021-04-02 03:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c90fcc8b556221b451e1c8d50fad3a9a SHA-1: 9e6eb52cfa35560c3bf2418b37c5ba3ba5590331 SHA-256: 4da3ae834f9aae2c2c4d73b3ee8e291700956a3ef505c6540393a1f604c79a6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9957

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://botokaw.ru/123?utm_term=rise+of+the+kings+game PDF link annotation
    • http://bonuwefuganagus.22web.org/pasubufugenunetelajabujed.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/kennzahlen_bilanzanalyse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_5fea2b8eaea73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_60664be84ba57.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/42945963212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5fd7dca90dcfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457843/normal_6052a2f360ca4.pdfIn PDF document text
    • http://ribininewo.22web.org/14818506157.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/62907238814.pdfIn PDF document text
    • http://dakixofib.22web.org/85536014464.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/scert_telangana_text_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460446/normal_600d50247f3f6.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/flowers_for_algernon_summary_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5ffac5db58b65.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/5957952283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_6052db35877c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5ffa2af5a9722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_5fda5c23ef6ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_604dba665c520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86cbbebc-4944-4dc5-a56d-6291498447fc/honeywell_xenon_1900_usb_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4012088-d633-4e9d-a8ae-be65aa850962/16775275992.pdfIn PDF document text
    • http://tosefiwaniw.rf.gd/81048782604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce9026c-7be5-4893-b758-cd58cf290967/solucionario_mecanica_vectorial_para_ingenieros_estatica_capitulo_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe0f18e-f6f1-43d7-ac30-92c0d19268fe/xasuw.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/botany_multiple_choice_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f9f8fe-7999-4509-9aa3-251d09c62600/72252024366.pdfIn PDF document text
    • http://kimafixenij.epizy.com/manualidades_hechas_con_papel_corrugado.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_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 5124 bytes
SHA-256: 06aa9eca3607726f7c17e679f9e025d5a6a1f1e71727368fe5e6ed25ce3348d5
font_01_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 10932 bytes
SHA-256: 7d13c15b8516023a0354f638bdf29fc9dd8edc96475989519f564ed558ab984f