Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4276dece5e99c3…

MALICIOUS

PDF

72.2 KB Created: 2021-02-14 06:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 84f82b4b3f3fd89026180dfeaa4ccdf5 SHA-1: 9e5fef184b30a5ae75e53a302a32804478706016 SHA-256: 6c4276dece5e99c35c9488f2a2bcda6e0ecdefb070499fce26979be6bad43e4b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically referencing 'ativar office 2016 manualmente' (activate office 2016 manually), indicating a social engineering lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score further support malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links suggests the document is designed to redirect users to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=ativar+office+2016+manualmente PDF link annotation
    • http://itsamorem.com/professor_messer_securityw9n7q.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/ifgcgef/msc_fly_cruise_deals_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/aiahbsO/tagoxamonaramogoxewisura.pdfIn PDF document text
    • http://kamini33.ru/27479191355mscr3.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/hb5idQ5/96429325737.pdfIn PDF document text
    • http://indital.fun/todifipodijuzulen9acg.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/jcsyiiI/47019902930.pdfIn PDF document text
    • http://premiumpornclips.com/tesis_de_alcoholismo_en_adolescentes99idc.pdfIn PDF document text
    • http://betmoy56.com/relokalapewoo3mnr.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/lagedivimilaw.pdfIn PDF document text
    • http://firstsecu-paypal.com/innovate_uk_funding_guideslm54.pdfIn PDF document text
    • https://cdn.sqhk.co/reravarev/OfjjiiW/63266402150.pdfIn PDF document text
    • http://vash-fasad.live/joleroxekufezenagejkwii.pdfIn PDF document text
    • http://gonzo-3d.com/gartner_report_2019_siem94x2t.pdfIn PDF document text
    • http://copyrightreports.com/temisabln6yq.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuvegox/bgcBpia/blackpink_lyrics_offline_app.pdfIn PDF document text
    • http://yesnutural.space/risk_assessment_template_for_software_developmentcuj1u.pdfIn PDF document text
    • http://deflecfcvy.best/base_smart_home_systemsjkws5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxemofunox.epizy.com/format_factory_full.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/worksheet_tab_in_excel_definition.pdfIn PDF document text
    • http://bovinow.epizy.com/free_printable_fractions_to_decimals_worksheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 5376 bytes
SHA-256: 4dea45fa06238496148d992cdfbaa78870dd99ff06dba3cdf49dbfc4b9969077
font_01_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 11352 bytes
SHA-256: 147d6881bd54b0b6f059571f45ca867787d495398311cc33864fb83d9743ba97

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