Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52feca9ea29c0cf…

MALICIOUS

PDF

78.6 KB Created: 2021-04-01 13:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a49a4c6012ae50f3a742afdf63a246d2 SHA-1: 18292a52dd7404439d02dfc008b0905b2019b869 SHA-256: b52feca9ea29c0cfd21323236389303ced6a9b4630cea18739c6111b1765fbab
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The primary malicious URL identified is https://seumenha.ru/award?keyword=mechanical+actuation+systems+pdf, which is flagged as unknown reputation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=mechanical+actuation+systems+pdf PDF link annotation
    • https://cdn.sqhk.co/fukonovum/GjdwHii/vidiwijavotuderinu.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/gegfic1/vibazusi.pdfIn PDF document text
    • http://lumasilove.iblogger.org/jurnal_anemia_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/mUjhihp/1963177932.pdfIn PDF document text
    • http://razagewodun.iblogger.org/formation_anglais_online_gratuit.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/cBgjiVM/repunuvepoturegisivinil.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/4gecOhK/wuzukata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rumajajoneder.rf.gd/upkar_psychology_book_free_download.pdfIn PDF document text
    • http://diwisowaf.rf.gd/xafizodasetukusum.pdfIn PDF document text
    • http://misukejijixuke.epizy.com/463612326.pdfIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_680f97d2228c44e4bf38bda3fd3675e9.pdf?index=trueIn PDF document text
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_7476365aad8d4daf91120c5e82300259.pdf?index=trueIn PDF document text
    • http://bamomaw.epizy.com/votupudilijata.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/topidulotukalewi.pdfIn PDF document text
    • http://gesebokumu.epizy.com/pretty_little_liars_actors_real_names.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/baixar_apk_android.pdfIn PDF document text
    • http://wusanobe.rf.gd/47800606872.pdfIn PDF document text
    • http://fiduritunibo.epizy.com/fulujesogabafetelaxus.pdfIn PDF document text
    • http://bikevobo.rf.gd/ziweraxuzufomibelodakobi.pdfIn PDF document text
    • http://golizewojavizav.epizy.com/dururikezi.pdfIn PDF document text
    • http://dolaregasa.epizy.com/shark_euro_pro_x_vacuum_filters.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/cisco_firepower_2100_cli_guide.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_752cc340daad48a489b6bc00a792c37c.pdf?index=trueIn 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_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5408 bytes
SHA-256: c24e526947dc7d71d42641e71adfdc2c1483d25c6b5f1bf6756f3e413a31fd36
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 11316 bytes
SHA-256: 7f0ed805b4a442ee500608348571833c826800514dcd625c8643f275eac937ea

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