Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a80a274efe5219…

MALICIOUS

PDF

87.4 KB Created: 2021-03-18 16:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6890326139960f18cf0b5af5398cdcb5 SHA-1: dd763caa816e74767af8927c66ea4da23d800454 SHA-256: 54a80a274efe52197f32cf91640f26daba118f1edba39b35973e51c462521d5e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=fibrous+dysplasia+jaw+case+report
    • https://mujatasibofemi.weebly.com/uploads/1/3/5/9/135963028/9949280.pdf
    • http://rugozuravonabib.22web.org/bose_700_soundbar_remote_manual.pdf
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/xevamopajimusa-pariseti-bepofarul-vadas.pdf
    • http://lovasosirukes.iblogger.org/loteruse.pdf
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/wirax_gibufesamaguv_sudeno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zesotat/paropirizojowokuz.pdf
    • http://walinul.epizy.com/beats_solo_3_vs_solo_pro_sound_quality.pdf
    • https://s3.amazonaws.com/tomamujuf/w-_4_employee_withholding_form_2018.pdf
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_c41d826257a447a697cd8266eab60cda.pdf?index=true
    • https://s3.amazonaws.com/kesumasaka/81941372899.pdf
    • http://totenudiwuwodu.epizy.com/57988273633.pdf
    • https://s3.amazonaws.com/zebarufuridorur/megizinidaxodexaj.pdf
    • http://mujujilunel.epizy.com/tumonewelexewogiweluj.pdf
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_3a1b423cb79f4da5b55def960af95bf0.pdf?index=true
    • http://tujefozumuresul.epizy.com/jolaj.pdf
    • https://s3.amazonaws.com/zikeko/android_sdk_api_level_list.pdf
    • http://xavelatevina.epizy.com/wezuzekasirenom.pdf
    • http://jibomivuren.epizy.com/foods_to_avoid_on_keto.pdf
    • http://xepalufozakot.epizy.com/mivimarazed.pdf
    • http://xofunuxemijowex.rf.gd/phpoffice_spreadsheet_to.pdf
    • http://pikuvideposem.epizy.com/ripigopixoki.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_21d1bae79765471a9b838b8c8431c5fe.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011413.bin
86519dbc8fc4d6b77de3222fbf2f416d8518d6338d5d399a68b201588837ed2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 5432 bytes
font_01_sfnt_off000126ab.bin
64b251ff4b5c80057f4a328b9d904a4c064b84716d0f7b5fd6b9ec67d22b9c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 12932 bytes

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