Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c308c940c74260…

MALICIOUS

PDF

73.3 KB Created: 2021-03-27 11:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b2898db1502cf77fb34073c3531545cb SHA-1: 71156dadaea18cb0bb7937e8bde8da8e8aecf988 SHA-256: 81c308c940c742604f841a75632b2fdf0503410ab71a0812e77f90a1d5ae55cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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://crophysi.ru/123?utm_term=novo+catalogo+hinode+ciclo+2+2019+pdf PDF link annotation
    • http://fimewovoko.getenjoyment.net/ensayo_sobre_energias_renovables.pdfIn PDF document text
    • http://lawyer-consult.ru/what_is_ideas_in_the_six_traits_of_writing55a5e.pdfIn PDF document text
    • http://edevletorg.com/fuvukagudoz7zb8n.pdfIn PDF document text
    • https://cdn.sqhk.co/xakalodesi/jagg7ie/56605544229.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/after_3_anna_todd_english.pdfIn PDF document text
    • http://istlan.fun/taotao_scooter_repair_manualeufv2.pdfIn PDF document text
    • http://fbcopyright-center.com/7501556159998mly.pdfIn PDF document text
    • http://xteenware.online/lonely_boy_images_with_quotesmard0.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/cfibyib/dupolepezidikulatol.pdfIn PDF document text
    • http://jiwimejikigigu.mywebcommunity.org/kemelivibexokixovekotegad.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/hePijbp/93104450080.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/xgfjcje/78801588286.pdfIn PDF document text
    • http://givepamodugag.22web.org/zazepodasavoligoropi.pdfIn PDF document text
    • http://lekanevakima.iblogger.org/akreditasi_puskesmas.pdfIn PDF document text
    • http://tazanup.mypressonline.com/how_to_be_studious.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/40b5b473-3a29-4a1c-b2e6-befe16babe59/energizer_nimh_battery_charger_red_light_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216ababd-a811-4b22-a4ba-4eff0f219086/botitogebasud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bee952-94a3-493a-85b5-8d7768a7beb0/music_and_movement_activities_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960d85c2-ba3b-44a0-ab73-2946fed55055/adp_payroll_user_manual.pdfIn PDF document text
    • http://zopusawonomiwi.rf.gd/vuzipuladuzaba.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/agile_agile_project_management_kanban_scrum_kaizen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3212aae8-fcb9-4a2d-87a2-de078a4a279a/the_lion_king_full_movie_2020_in_telugu.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/fax_cover_sheet_template_libreoffice.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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 5652 bytes
SHA-256: 834cfca9cbe420f94d772c1290f0ad208911bfec1d7c3dbd07fcd7cab3cd60c0
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 12088 bytes
SHA-256: 21a27aade7d9ed2c9dca8d6dcb9cc246fb0e813cf4eb66775c56735bf407198b

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