Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbf94d208dd0917…

MALICIOUS

PDF

82.5 KB Created: 2021-03-23 23:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cb3b91f7d4bd058e9e39a6cdd68fa8f SHA-1: 18425ec14efe3d416f0beabb53b2e79dccaf879c SHA-256: 3cbf94d208dd0917e6ec0e9148b9ec206bcbe5098596932cd862e64669683c1c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wix?keyword=the+very+lonely+firefly+reading+level
    • http://radogomi.mygamesonline.org/best_call_of_cthulhu_rpg_books.pdf
    • http://zumufufup.sportsontheweb.net/84787849309.pdf
    • https://cdn-cms.f-static.net/uploads/4482020/normal_5fd823dc18cd6.pdf
    • http://vawabipoxe.sportsontheweb.net/pembuluh_darah_arteri_dan_vena.pdf
    • http://melifalafijuz.22web.org/jevubefemeg.pdf
    • http://masuxokovofa.66ghz.com/mathematica_12_mac.pdf
    • http://mx50off.info/what_is_the_plot_of_the_revenantzwcmg.pdf
    • http://mavitrade.com/bansal_classes_study_material_free_downloadtbq64.pdf
    • http://shop-profildoors.ru/forrest_mims_circuit_scrapbookiro1w.pdf
    • http://ejqy.com/server_maintenance_reportdzxxu.pdf
    • https://cdn-cms.f-static.net/uploads/4406482/normal_605993ef7f639.pdf
    • http://pejokepi.mywebcommunity.org/26091856873.pdf
    • http://berkeciftci.net/lafowewikebuwutomatoj6x2uk.pdf
    • http://kixiwogazu.sportsontheweb.net/armidale_map.pdf
    • https://cdn-cms.f-static.net/uploads/4460954/normal_60494551d663f.pdf
    • http://bagerisevi.scienceontheweb.net/warrior_cats_name_generator_quotev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_26c93ae6585b46d782b1be699bd61b4c.pdf?index=true
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_a8c5dfa7608c4cef842208b9abce4cde.pdf?index=true
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_b2014c469ea44d32b7b728f173b4b255.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_66fe936ca66a4825a21eae4cf80f353f.pdf?index=true
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_65474f3be125411fa73fa9475344e28f.pdf?index=true
    • http://kagijido.myartsonline.com/68342020573.pdf
    • http://rurebafib.onlinewebshop.net/15790068174.pdf
    • http://pezamax.myartsonline.com/aneurisma_de_arteria_esplenica.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f793.bin
e430ac4be3ce38c08ec43cebd0a718af3917d65ca5607ca871579448790aa8c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 4812 bytes
font_01_sfnt_off000107e6.bin
bf36070523fb13140e45017fce00b90ea238c3cd1f2b31a7cbb470e94e592143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 11028 bytes
font_02_sfnt_off00012dba.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 4324 bytes

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