Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bda4a88202ea4b3…

MALICIOUS

PDF

89.6 KB Created: 2021-03-26 08:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e547719954ed86f4c637fe5ce954e2d3 SHA-1: 0a4ae17af0d374fd6ee9b351a8960fb157ed2dcf SHA-256: 3bda4a88202ea4b3efcacdc6ffe05cc27c16b62331ee1a6ec65c56f4a2ab331f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support this assessment, flagging the file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=how+does+the+mini+series+defending+jacob+end PDF link annotation
    • https://pipabujul.weebly.com/uploads/1/3/2/6/132680817/7252036.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/crash_team_racing_nitro_fueled_vehiclesuy904.pdfIn PDF document text
    • http://arm-watch1.club/2859455492051met.pdfIn PDF document text
    • http://zebrait.fun/75333229745ul9ku.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/57341746743.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/48526326258.pdfIn PDF document text
    • http://teksalon.xyz/django_rest_auth_email_templatew31bb.pdfIn PDF document text
    • https://mugibutu.weebly.com/uploads/1/3/4/7/134714928/fixuzesareka-nufukopeku.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/military_course_codeag9pu.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/c6e1f8e7-8ea6-482d-9acc-88b2b977802e/would_you_rather_questions_for_dirty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d43b1c-dbf4-489e-8312-50709805e6a4/does_papa_johns_have_thin_crust.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/police_sergeant_interview_questions_and_answers.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_cb5d6c6223cb458f828da486adc7e253.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixanarer/akon_album_free.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/nokijirebonudeparavu.pdfIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_c977433194e84e6c8691d13125adbbd6.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_ceeed39e5bf3434e857af49fcfa77b6e.pdf?index=trueIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/fisil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b697b74-577c-45b9-8c7c-8b7c17f16d6b/what_is_biblical_hermeneutics.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_62aede2872ea4c52ab8449c89c1d7c59.pdf?index=trueIn 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_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 5672 bytes
SHA-256: 0e6b17b378d8d5ac5d4be83a17734bf8665fd2b13989fb9d16016a3e9b5af57a
font_01_sfnt_off0001327e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 11540 bytes
SHA-256: 04544038052185220d645874c5ae10f81b3f583005da343dad7cd1d486c27cfe

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