Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b24f0f4077c2e5…

MALICIOUS

PDF

75.4 KB Created: 2021-06-14 06:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 285447b5fb8a6156adbbb9432b92da4e SHA-1: 1840cca8c2d549137758eaec6582b1c343335464 SHA-256: 87b24f0f4077c2e58a9c80d63b35d6385d3ed19516258face0579c0eb9063151
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'irlanc.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm designed to redirect users, likely to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/pbw?utm_term=photosynthesis+making+energy+worksheet+answers PDF link annotation
    • https://gerapulopenun.weebly.com/uploads/1/3/4/5/134587141/4df9abe958ccd2.pdfIn PDF document text
    • https://sivabukejiwija.weebly.com/uploads/1/3/4/4/134459056/dejewol_tokumekexi.pdfIn PDF document text
    • https://xaxidotuviw.weebly.com/uploads/1/3/0/9/130968933/wesagado-romanezotasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fudejob.pbworks.com/f/ielts_writing_task_1_pie_chart_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e511ea55-c330-4d7b-860d-41bc02d60d78/nudogewovizore.pdfIn PDF document text
    • http://vuxoris.pbworks.com/w/file/fetch/144844905/gibotodikudugonumizal.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144548676/87718227424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedb9f86-bda8-4f0c-8cd7-088508cc1921/tovobitowufimenege.pdfIn PDF document text
    • http://juxivos.pbworks.com/f/wijuza.pdfIn PDF document text
    • http://kopiginawavu.pbworks.com/f/48948542411.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144454605/descargar_geometry_dash_para_pc_windows_10_gratis.pdfIn PDF document text
    • http://jumogitakos.pbworks.com/f/download_pivot_animator_apk.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/is_pcl3_ionic_or_molecular.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144719829/gezujijaju.pdfIn PDF document text
    • http://bikopatepo.pbworks.com/w/file/fetch/145274967/jafiwelegoxoximiponaxija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d4bf50-d9fd-45aa-9ac5-b4a1a14f5270/tyler_florence_pork_shoulder_rub.pdfIn PDF document text
    • http://wukexav.pbworks.com/w/file/fetch/145025892/poxumejuvubizuv.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/w/file/fetch/144626559/wejaxori.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144500772/how_to_read_a_digital_badger_water_meter.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/98185660159.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144602544/79960042131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62cb14c-7964-4ac9-a38b-ce384b8f2e71/12106081072.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144848919/libro_los_4_acuerdos_de_miguel_ruiz_gratis.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/python_programming_for_the_absolute_beginner_3rd_edition.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_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 5324 bytes
SHA-256: ca2e93b9f4d6888a005b0c19c2cc62832e2f6ead285c51f89ce31385c95653c4
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10544 bytes
SHA-256: 25946ee08b156bc0348c1d5c0cf502779523289de478ce828275b1b8c6520a2d