Malicious PDF — malware analysis report

Static analysis result for SHA-256 4317f622a87cd8d6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 01:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0fcf782c9700a9c10641bff64fb7af5 SHA-1: 5cd8c7f698c5a5283a372bec23d61b344a87dc8e SHA-256: 4317f622a87cd8d6ff7c889538e536970337a12a9521ba6d16456dfb04f6f49b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The file's purpose appears to be directing users to potentially harmful external sites, as evidenced by the numerous unknown reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/61013011118.pdf In PDF document text
    • http://aviatechinform.ru/sadm_files/45807477447.pdfIn PDF document text
    • http://ledins.lv/cms/file/77709275080.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7cc5a1e7ea076e961a277e93af77cd13/kamuragaxoxezalozo.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/bemagigudizametukinogozo.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/97594416192.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/79c371d914761b2d5d48a50892c3f12e/tupijisokadisi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wexizifimiboxapug.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/boxuboremewevi.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/lilapejezeninaxuvow.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/vitefozivopizogedoxewal.pdfIn PDF document text
    • http://dnepropress.net/files/file/45567872865.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/raturu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021918623706.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/talekavibekegede.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/92691042974.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/80231484766.pdfIn PDF document text
    • http://chinalabware.net/d/files/90976552903.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/sikitepofuponebo.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/25582604588.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/vezeranekigenazo.pdfIn PDF document text
    • http://aprt1day.ru/file/mimesarivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=skills+audit+template+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 10600 bytes
SHA-256: b9a6913cfd5404bce45aac5a93d9a0fc5ff34a34ee858c31ae689a1bf4d9c5c6
font_01_sfnt_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 15744 bytes
SHA-256: e7ed08e8b0835a980b0b50e35aee2918d40f1bfa67e56cc7efb0d1b0dacf7f7f
font_02_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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