Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a9be357c33676f…

MALICIOUS

PDF

83.2 KB Created: 2021-02-06 07:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 94af638d249fda0be08371bea20a6d2e SHA-1: 1bb300efc4fd29dd1d7cf92168997dd17ec20e94 SHA-256: c8a9be357c33676f66bb8b05edc11b504d6033677ce8ab07fc9b44ba65562824
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=von+th%25C3%25BCnen+model+explained PDF link annotation
    • http://wowit.pro/dabbe_filmi_indirdjr5r.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/Yx6wi6X/rudimewexewolasibozukekaw.pdfIn PDF document text
    • http://copyrightsupport-ig.com/85270458716serp4.pdfIn PDF document text
    • http://hookup154.site/42911454127drivm.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/iTvXjcy/descargar_apk_de_geometry_dash_world_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/hhejgLG/72284778324.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/9digmPy/acode_powerful_code_editor_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/CiaSgiy/jumenikinapuse.pdfIn PDF document text
    • http://jobs-ingenieur.best/tojunobamoyl.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/he0heh4/talking_cat_surf_runner_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/BiiJiic/mafia_the_city_of_lost_heaven_gameplay_ita.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/bomifabipi/infectonator_3_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/74080685397.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/skymovies_in_new_south_movies.pdfIn PDF document text
    • http://xudadadof.epizy.com/vmware_14_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/72533060178.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/abbreviated_form_of_journals.pdfIn PDF document text
    • http://tizaxamadifar.epizy.com/68149297387.pdfIn PDF document text
    • http://roduteberilexel.epizy.com/44139562869.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_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 5080 bytes
SHA-256: 29e9ad2e4bda6a4141da5fab4d511dd440d7aacd115817bd804a170653bc1e7b
font_01_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 1716 bytes
SHA-256: d0f49cc195c1bf31025e9f0e2a1c0016543c567966f58b7536460b272fcd7c9a
font_02_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 12112 bytes
SHA-256: 8b37c418967a781f4db2025cf03424f0bcd446bb6b7e4a38880b70b30de7853f

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