Malicious PDF — malware analysis report

Static analysis result for SHA-256 101acef26e2dbb17…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 03:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6feacea8fd93389c18165794d8f971b6 SHA-1: 51c7daf481fa84199476ce2577d799389182de5d SHA-256: 101acef26e2dbb1783aca88b073463107abd376ff78290267d2bf3fc3a929f59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including a link farm heuristic firing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=pokemon+mega+unblocked PDF link annotation
    • http://haohanlegend.com/Uploadfiles/files/44546688834.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/96348220424.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/xugivotefukut.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xeviruzifagadaze.pdfIn PDF document text
    • http://csp.hu/editor_up/vorozu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/23862894339.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/59449199676.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kepesazifanibikene.pdfIn PDF document text
    • https://anjingliar.com/contents/files/19422716533.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/35118470586.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/73987466549.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145aad3013f8---61840920227.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/lumaw.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/8562157318.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/93473913495.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/xutagepudani.pdfIn PDF document text
    • https://olterus.org/contents/files/fegexotifosidifuv.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/japosuze.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wopomonuwawada.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/dewezakegi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fef877aee---69466184160.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/rinijemodegomimunoru.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/2601398150.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_off0000bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD27 10588 bytes
SHA-256: 3a0cb32368885957e7cbff53878a813ead9930efc38cea8aac1afca73ac14d4e
font_01_sfnt_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 16732 bytes
SHA-256: d071d9b42a39d84c466d736f64225a15dde2fd6d17bd70f5b60824c29fb96358
font_02_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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