Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9e501cfb335315…

MALICIOUS

PDF

77.3 KB Created: 2021-03-30 04:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b83f72c9de9d242d40cf386bb8021c78 SHA-1: 5a6ad5a1cb92c8906ac6ba4ed58d148a9d11995b SHA-256: 8e9e501cfb335315776885c7eec42fdb3dbefb69c956d7941944016834a89cba
134 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a primary suspicious URL being https://jacksth.ru/wix?keyword=fau+club+directory. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, further suggesting malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=fau+club+directory
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/sewiwazub.pdf
    • https://wubeponasi.weebly.com/uploads/1/3/1/6/131606197/8543ca6.pdf
    • http://komaxinatobofe.medianewsonline.com/raxalunu.pdf
    • http://penaleduduzib.iblogger.org/83084694066.pdf
    • http://xovebud.mygamesonline.org/bidovawivobinomux.pdf
    • https://cdn-cms.f-static.net/uploads/4368474/normal_606018e5a69eb.pdf
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/vuvogupimimewisufibo.pdf
    • https://static.s123-cdn-static.com/uploads/4370074/normal_5ff1ced68d845.pdf
    • http://nopazurexubiwis.22web.org/business_english_tenses_exercises.pdf
    • http://jixewelo.scienceontheweb.net/candlestick_forex_strategy.pdf
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/0527e8.pdf
    • https://static.s123-cdn-static.com/uploads/4387219/normal_5ffd47c47b4a2.pdf
    • https://cdn-cms.f-static.net/uploads/4482190/normal_5fe9d0b0d3ff2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/208d2563-e95a-4d64-b6c5-40270b370201/livoxekoronovu.pdf
    • https://uploads.strikinglycdn.com/files/36170236-7eb4-4ae4-83c8-0f4227c3706b/biografia_de_modelo_atomico_de_schrodinger.pdf
    • http://zipulosi.atwebpages.com/noxoretejixi.pdf
    • http://dinixebun.epizy.com/43702877101.pdf
    • http://fejidofov.rf.gd/reversible_belt_conveyor_design.pdf
    • https://uploads.strikinglycdn.com/files/602b58f2-a7d3-4e6a-99a4-382d8336ef7d/paworegodiwamuf.pdf
    • 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_off0000f003.bin
18066ca7f125912222e228a06c55650a2f1a4ac7ea406f16f4a6d5baf2e51475		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 4952 bytes
font_01_sfnt_off000100ef.bin
fa025e162630948e7fd86e50dd5145e84e4165a46eee0e960dde1ccac1ed3ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 11116 bytes

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