Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51b0e3fa5a6e9ae…

MALICIOUS

PDF

83.5 KB Created: 2021-03-07 04:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7e1a6cad79ec1633c9fd5a49132f268c SHA-1: dc6beae48515864a428e6904977603083ec4261e SHA-256: e51b0e3fa5a6e9ae9ea233367a81734279d8c0f86b6324649269754b85c41207
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://xajibur.ru/wix?keyword=refrigeration+and+air+conditioning+technology+4th+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/jutafegobexe/JGL4jho/zozodura.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/modelo_atomico_de_schrodinger_postulados.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/gefumuvafosodirovebalasa.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/whale_talk_chapter_14_summary.pdfIn PDF document text
    • http://dabuvede.66ghz.com/70567641841.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/78901628400.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/cjct8K0/planets_align_july_19_2020_time.pdfIn PDF document text
    • http://tosidegomutif.iblogger.org/wayne_dalton_garage_door_opener_remote_model_3973c.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/9o2hhhh/36543018518.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/Phhro4A/xubudemajoxekasidab.pdfIn PDF document text
    • http://ganolegelaso.22web.org/19662788215.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/QgdSVkh/62004036007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zemadepa.rf.gd/certificate_of_conformity_template_australia.pdfIn PDF document text
    • http://xogonat.epizy.com/gavozomodux.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/zurox.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/bet9ja_new_mobile_app_apk.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_94cb51d2ce564fcfbc5a018608e789ea.pdf?index=trueIn PDF document text
    • http://lekukulefu.epizy.com/rowixesofalurutekelerituf.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/ball_games_free_online_no.pdfIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_ed5fa027ae2240a899b1eb18a364cdb2.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_2197456de2a344d78eea8f265d5c0489.pdf?index=trueIn PDF document text
    • http://dunupilopun.epizy.com/lullaby_of_woe_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/trilinear_vs_anisotropic_performance.pdfIn PDF document text
    • http://bolekatu.rf.gd/war_of_the_worlds_book_vs_movie.pdfIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_cf0b1e1015214fedbf9ee6db8ad8fb33.pdf?index=trueIn PDF document text
    • http://xetibewiz.rf.gd/83401938322.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/church_of_scotland_safeguarding_form_sg7.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/francis_bacon_the_new_organon_summary.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_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 5436 bytes
SHA-256: c1429c7ef60d6647776c02871ab1387cf212147c0ddf2bdec02803c7e2fd5406
font_01_sfnt_off00011a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 10712 bytes
SHA-256: 4bd250a2ff920a0c51269aec37c01d13548ae317d9aa7a3af0de63032daa52be