Malicious PDF — malware analysis report

Static analysis result for SHA-256 39082ba90dc473aa…

MALICIOUS

PDF

80.4 KB Created: 2021-03-17 05:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 53cb980a10e9354baf1322c9c8d7ef56 SHA-1: b399f668a0c4b6067482ee72defd55c27cb3bce2 SHA-256: 39082ba90dc473aaa1ba1e24da476edb7f2a031d32d0a9b5b79c2c9af81428b8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL pointing to 'resalured.ru', suggesting a phishing or scam attempt. The PDF structure and heuristic firings indicate it functions as a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=what+math+concepts+are+on+the+sat PDF link annotation
    • http://tupakewufitid.iblogger.org/pulimojevajasoraw.pdfIn PDF document text
    • http://beritox.medianewsonline.com/reducing_and_non_reducing_sugar.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/bier_block.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/maxcare_extended_service_plan_phone_number.pdfIn PDF document text
    • http://wumakelanatug.22web.org/american_pie_5_fzmovies._net.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/libro_arqueologia_del_saber.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/dakumatosoju.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/homelite_blower_vac_parts_diagram.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/vernier_bevel_protractor_least_count.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/my_harbor_breeze_ceiling_fan_stopped_working.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/69993153343.pdfIn PDF document text
    • http://buxeletifexid.medianewsonline.com/young_and_freedman_university_physics_13th_edition_solutions.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/occupational_respiratory_diseases.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tatasuvuputo.epizy.com/tegubolikipabew.pdfIn PDF document text
    • http://rizeluma.epizy.com/fha_manual_underwriting_guidelines.pdfIn PDF document text
    • http://pelubameta.epizy.com/infrastructure_as_code_terraform.pdfIn PDF document text
    • http://fuvezijejek.epizy.com/the_storyteller_jodi_picoult_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7948de47-ca5b-4d40-a198-09430a777b45/how_to_connect_propresenter_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c645c773-0cbc-4121-a7c4-c7c8a8714538/61331060190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ced551b-2509-47e2-a92c-001b8aae713c/download_film_the_divergent_series_allegiant_part_2_subtitle_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3bc8ff-69f0-4aef-be53-8b85502ac048/how_to_measure_education_effectiveness.pdfIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/barrett_formula.pdfIn PDF document text
    • http://vazefetapo.rf.gd/banazavix.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_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 5152 bytes
SHA-256: 28494622b754a90e9669357d64536416457135911970146dfe38bcac98b81fa3
font_01_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 10892 bytes
SHA-256: 55af2a598daf25e81ef8b5596f278a14793a765a070e4d853eb0ab4b122be8bf

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