Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecb8067a0e39f2e…

MALICIOUS

PDF

84.9 KB Created: 2021-03-31 19:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b4a86eb8b10659cdc024b3d7579d5914 SHA-1: 047800f0c2ba0a754e66ba364027787e61a029f6 SHA-256: 4ecb8067a0e39f2e078dd9ea39ed8b286af692656b304b4d0229e37b693d7792
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO poisoning attack. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to manipulate search engine rankings or distribute further content. No scripts were extracted, but the overall structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=good+times+menu+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461751/normal_5fe72988640d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384471/normal_600690cb01d5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5ff9ebaf575e2.pdfIn PDF document text
    • http://lenaragiguvajir.22web.org/caractersticas_del_aprendizaje_significativo_y_memorstico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_5ff2313ae7c4f.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/VexYY7K/real_time_shields_tips.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5fe268fe63f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446762/normal_60159bbd901ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481665/normal_605a79244971e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_5fe78916a3b2b.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/tgchbR2/wovox.pdfIn PDF document text
    • http://bijopesenof.iblogger.org/fejudadetapudedupulilejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_603894f6c9c7b.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/BCPP1gh/73176115374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_600cfc22371ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf129db-7884-4468-9f66-8acef69a448f/exide_battery_charger_price.pdfIn PDF document text
    • http://kadapefiwemol.epizy.com/zeremofawojovevufosefezov.pdfIn PDF document text
    • http://jipuzekas.rf.gd/jozatowopaduwotom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af868260-935e-495f-8bf8-a9c3c3027999/35353722576.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_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 4880 bytes
SHA-256: c2355eeacadc2cabb24ed95b4a4d36ff74109e3d3e8fc9a36e4cf77b74f93948
font_01_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 11044 bytes
SHA-256: 8f2cd82412d63ed6276e1e6bb64b66495c10fcd434209804f3494391b073d6c2

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