Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb084d6e5d95be5…

MALICIOUS

PDF

77.0 KB Created: 2021-05-03 15:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 497b464691a4db8ba689a5f2032050b5 SHA-1: 14695c1dd4ad93df1e06539cb0c8c9b24bacda61 SHA-256: ecb084d6e5d95be515537cb28d9c6717f80b294fa8519ce3abe4d6dc463ccdc7
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards an attack pattern involving redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=multiplication+table+flash+cards+pdf PDF link annotation
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/pexemukedupazam_gesasuxifulusud.pdfIn PDF document text
    • https://cdn.sqhk.co/zafazegig/cXIChfZ/all_android_mod_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/mumepefofise/ieQ4hfC/78895603495.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/lopotijejelo_marakewegarogas_zolazapapuvaxe_zuwoxipixojosej.pdfIn PDF document text
    • http://skidki-day.store/arduino_mega_digital_pins_not_workingmpe4v.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/egghbih/volume_of_cone_practice_worksheet.pdfIn PDF document text
    • http://securityverifiedservices.com/how_many_carbs_in_a_dunkin_donuts_sausage_egg_and_cheese_wake_up_wrap45tyc.pdfIn PDF document text
    • http://japancar-sib.ru/drift_hunters_madalin_stunt_cars_3sqb06.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/hgja4ji/lujajidigo.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/HkPicgf/tap_titans_2_artifacts_for_clan_ship_build.pdfIn PDF document text
    • http://insurancecarusa.com/73910703914tqylp.pdfIn PDF document text
    • http://wrinklestiltskin.com/demostrar_identidades_trigonometricas_ejercicios_resueltos923i7.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/eOU5Nii/xevoxifawogoruxevepule.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/datarofapakil/95004917176.pdfIn PDF document text
    • http://zagafelegaxo.epizy.com/gusanoxu.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/albany_georgia_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/fevedopuvoxekuruwidekaz.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/vereseru.pdfIn PDF document text
    • http://wutewak.rf.gd/81774330836.pdfIn PDF document text
    • http://ladibemotivusam.epizy.com/blog_page_design_template_html.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_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 5388 bytes
SHA-256: 3f243a1e9b8aa61336d1064d490432babac3d54599a5962eea28d0a02c437870
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 3292 bytes
SHA-256: acbb08e4463b4aadd794bc408d71a5e49487ee25c4bb4a8a3e224297a4d470c3
font_02_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 10816 bytes
SHA-256: 3c01519b771eaf5cf58452537989be803bb0a537a1b52163a75975a8b2c848d9

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