Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbadaf39f985c879…

MALICIOUS

PDF

75.9 KB Created: 2021-03-09 00:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4fc305667b244b7baf36d5a17c26072 SHA-1: a7f1778b3f9bec6786a15536728f39617f1acb2e SHA-256: fbadaf39f985c8799a3606f2aa33099b05d3375643a5629d56fba17fdac8b0af
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URIs, with one pointing to a suspicious domain ('mezovuduw.ru') that is likely used to host malicious content or redirect users. The PDF structure and the presence of external links suggest an attempt to trick users into visiting malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=plate+tectonic+theory+worksheet+pdf PDF link annotation
    • http://xazigewit.iblogger.org/haynes_repair_manual_toyota_corolla_2003_thru_2005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_60165ec8e11c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_6018cb7d48fa8.pdfIn PDF document text
    • http://wutomomar.22web.org/49099069625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_5fcb9f4968435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fcf6325acf85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojaxalajavog.epizy.com/minecraft_xbox_achievement_world.pdfIn PDF document text
    • http://jaxurulefer.epizy.com/deraluwe.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/punoralowosekewesulepili.pdfIn PDF document text
    • http://jopivot.rf.gd/99782589380.pdfIn PDF document text
    • http://kunijudodo.rf.gd/avengers_infinity_war_official_trailer_music.pdfIn PDF document text
    • http://sesoxevanadike.epizy.com/classical_gas_piano_sheet_music.pdfIn PDF document text
    • http://motagetezo.epizy.com/formation_continue_agriculture_biologique_ile_de_france.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/9247481237.pdfIn PDF document text
    • http://wekapalipewux.epizy.com/nedodiremunena.pdfIn PDF document text
    • http://posugez.epizy.com/41871384834.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/fulumesomopaxuvij.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/gakolafidorigevag.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_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 5504 bytes
SHA-256: a2c71cd41b094a0a61d136b8281963c84e40a4bb341c7900778a464a5bb69a08
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10444 bytes
SHA-256: cd5a9bd9440a301ad1e30ff0ecaac5c2f1651739fc00b7e937937b773ba976c7

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