Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdeec78d5cbac10…

MALICIOUS

PDF

80.6 KB Created: 2021-03-16 22:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dff50b833189cbdc62c668f43d2523ef SHA-1: 5b094cc308032d8a56be4af3f6f7fddf27d53f03 SHA-256: 8bdeec78d5cbac109c08fa986a16241e90470fe86bde8b0d7b83ef1e3ac120f7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=brownie+exquisita+informacion+nutricional PDF link annotation
    • https://cdn.sqhk.co/maxanogefo/fheQjif/49473006647.pdfIn PDF document text
    • http://fortysgjdk.fun/kamutotisawixefalorehn97g.pdfIn PDF document text
    • http://trokot-new.online/85268305108g4cnw.pdfIn PDF document text
    • http://pochta-24.cc/airthings_wave_review46f18.pdfIn PDF document text
    • http://copyright-central-media.com/89301779344ys98z.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/materi_metabolisme_kelas_12_lengkap.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/g5DPSKq/sebalanirijuke.pdfIn PDF document text
    • http://rivokalodusi.sportsontheweb.net/didura.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/pobowixisavakijuzemarepiu12ay.pdfIn PDF document text
    • http://mibilivo.scienceontheweb.net/behavioral_economics_principles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://getakufo.epizy.com/juniper_switches_configuration_guide.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/cancer_de_la_cabeza_del_pancreas.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/gebotaretimabiteti.pdfIn PDF document text
    • http://livirava.atwebpages.com/estadistica_para_administracion_y_economia_anderson_9_edicion.pdfIn PDF document text
    • http://jaxojuru.rf.gd/86502058489.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/92444573219.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/wizkid_azonto_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/what_is_the_study_of_nuclear_energy_called.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/ninja_professional_1500_replacement_pitcher.pdfIn PDF document text
    • http://wuvasof.epizy.com/voice_recorder_ad_free_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 2900 bytes
SHA-256: 9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014
font_01_sfnt_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 5364 bytes
SHA-256: 108827146d4a6a5ff9bbbd193170dff08fd59db4c98efee5ece32ac4cca30363
font_02_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 12188 bytes
SHA-256: f4c1c1368d66f8693448ef2ff8147ac4a17aaf55f54c3f2fc7c6b49b97229251
font_03_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16352 bytes
SHA-256: 8bbdea4fa49cdc3cada8d46fde16cea30d2493fa90973530c0fc792dd0cf4864

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