Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcbccd60c26a06d…

MALICIOUS

PDF

71.3 KB Created: 2021-03-29 11:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e0c057ee23f5b687484afac5dc54bc7 SHA-1: 866a23961a34f44bfe4b5f7582f2276ca375a05d SHA-256: 5fcbccd60c26a06d95a4e78bcfe516a597094a96733e00dc3c22651d58e655a7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://jacksth.ru/wix?keyword=ark+snow+owl+saddle'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a tactic to manipulate search results or redirect users to malicious sites. No scripts were extracted, but the presence of multiple URLs and the phishing detection strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=ark+snow+owl+saddle
    • https://cdn-cms.f-static.net/uploads/4452587/normal_6020f955c373d.pdf
    • http://lodomujimujug.mywebcommunity.org/how_to_use_omron_intellisense_wrist_blood_pressure_monitor.pdf
    • http://pesuloduf.medianewsonline.com/vitepogepokuxu.pdf
    • http://rakajipof.22web.org/munabumatulegasosaf.pdf
    • http://pimebujeben.66ghz.com/3737203106.pdf
    • http://midimox.getenjoyment.net/panofejosur.pdf
    • https://static.s123-cdn-static.com/uploads/4421201/normal_5ffa2461b9d41.pdf
    • http://fojukivijivik.medianewsonline.com/91790573282.pdf
    • https://cdn-cms.f-static.net/uploads/4411915/normal_603c35b7b481d.pdf
    • https://cdn-cms.f-static.net/uploads/4450502/normal_6025ee73985ff.pdf
    • http://sokujojetutita.iblogger.org/dumibikabewosuvipel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mujevubutukoxu/gubadufotinemokej.pdf
    • http://fipotunisobojow.epizy.com/samumobujo.pdf
    • https://s3.amazonaws.com/bezorito/dudodumo.pdf
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_c78cbfd940c8439f8735ec977e2fbe54.pdf?index=true
    • http://zivexotafoni.myartsonline.com/58345533306.pdf
    • https://s3.amazonaws.com/zuwimadaneb/heroclix_team_abilities_2020.pdf
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_8fe739c162ee4a3e9257920ff3c6750f.pdf?index=true
    • http://wufizomofoduzin.rf.gd/67709010850.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_f7cf1cf77a71476bb20417d7c599de5f.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/log_log_graph_sheet.pdf
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_6aa6b4c0d0dd459b9737e9653d0fc0d9.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_off0000daa1.bin
947d8186621391975bf334c913436f72501174e1bd7065d0395742b84557594e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 4964 bytes
font_01_sfnt_off0000eba3.bin
1838eab9e0d80d6d031c9e5889f081643eb4140352aa24e0dbe6f674a9eaecb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 10644 bytes

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