Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23bd817bb0e3132…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 00:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d772b45461d0fe2f9da0ca8a76015ec SHA-1: 1511aa932b5ecb7972ce2a289989070a0241964f SHA-256: f23bd817bb0e31322a892b20119662d165b513a74d87af74d042766f92b0df66
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=walk+in+hair+salons+open+today+near+me PDF link annotation
    • http://suncitygroup.ir/basefile/suncitygroupir/files/zaxoxopadujojajinuxegevib.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/fisibutezodarazanarifume.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/35453762034.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/tobevazokarer.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/61512510722.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/nururesemigebozaka.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ff87429b---73538697561.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/siregaxanakimamur.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/suwenunevabesep.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/10940115454.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/jasilagute.pdfIn PDF document text
    • http://polipack.ru/content/file/wafaxajetumabepam.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///sanupumozu.pdfIn PDF document text
    • http://strandedtattoo.net/file/dogotopapeteresowuvate.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/41539745988.pdfIn PDF document text
    • http://elpijisystem.com/file/gefetotitewetakoso.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/lujowekasuseresenojuvaj.pdfIn PDF document text
    • http://esejsc.com/upload/files/jitamis.pdfIn PDF document text
    • https://ags-car.com/upload/files/53735464092.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/kegizuxavevipitolo.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/49687097796.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/lururimoxaxu.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/7532076940.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/81d41537205a9181ddd2c3d5cf319236/lokiwatejijete.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://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_off0000cb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 17400 bytes
SHA-256: 44d2aa7494493033003e1be74b20430e170629d5d04d3bf091148cb0b11593d4
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 10856 bytes
SHA-256: b9eb41837edab4b790fd749aed4b7560eb493ba5a8d2218b1f4ba4191af4b5ae
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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