Malicious PDF — malware analysis report

Static analysis result for SHA-256 285c9d44d34b563b…

MALICIOUS

PDF

91.7 KB Created: 2021-03-18 23:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012a72ca31d201dd5dd88145883667a5 SHA-1: 6ddc0148419ff3ee644e86f9567effc78c6806c4 SHA-256: 285c9d44d34b563beb04bc0552f7f5d009cc37886082b4e809ff5c9dcfa7d91c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards the exploitation of PDF vulnerabilities or social engineering to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=eylf+learning+outcomes+cheat+sheet
    • https://cdn.sqhk.co/tosuwukiwate/jadifgh/car_running_lean_fix.pdf
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/7004068.pdf
    • http://deflecfcvy.best/88312177901f8p6a.pdf
    • https://cdn.sqhk.co/poladejug/igeb3je/european_severe_weather_reports.pdf
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/9729021.pdf
    • http://azules.ru/matefrrwwx.pdf
    • https://cdn.sqhk.co/givogaduta/RtMhdgf/36431985733.pdf
    • https://cdn.sqhk.co/fifibaje/eLmijd8/bangalore_telugu_video.pdf
    • https://mofaxogarapew.weebly.com/uploads/1/3/4/7/134771612/kepolilusog.pdf
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/ruwereveke_vufoxoxasefev_ditasidezisaf_dulekuku.pdf
    • https://befomunuduti.weebly.com/uploads/1/3/1/1/131164266/9531143.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/36d9f440-653a-402a-911a-fb829548fed7/tabela_de_frequncia_estatstica_exerccios_resolvidos.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_e9799da39c364744b74e52c17497b3af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6f93c306-f745-4c12-8c26-ac51f695d96e/the_sacred_and_the_profane_the_nature_of_religion.pdf
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_ef9d2ed5a6784e228c6a31740c3f1d0b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6aa6cbf6-0c36-41d6-a741-fe853574cf73/90968176742.pdf
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_fb527b14d6164d21bb4f2c8ed9f2a9d4.pdf?index=true
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_31efc29881434596a4bc851155126420.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_7b74313983ca4b9189bd54f8c301b6c7.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_off000125c7.bin
43b42ccaf38c8e49755e13fa59e426b38fb7b88a98fb8a593811b1c6dd0637fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 5356 bytes
font_01_sfnt_off000137e5.bin
bd940640835301709a452fee93067dfd77a3e81b2faac154ddb7803df3f8a0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 12320 bytes

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