Malicious PDF — malware analysis report

Static analysis result for SHA-256 013d861a556198a3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 20:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e2e846c4aa4fe4bf45d8780d7a062cc SHA-1: 5d411b052313a82d21b731069cb9adb466678c1d SHA-256: 013d861a556198a3a920015f822c00298ee4dcacccae8e70bd5682d067912a69
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=wave+editor+for+android PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a5cc8c878aa2b7b61ec7cb21594451d1/14608078417.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/42041984898.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/kozapikinivazopakibelefi.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/64668668400.pdfIn PDF document text
    • https://filetorme.com/upload/files/6078833994.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/pudizefetukutotu.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/lezazetelosexu.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/33594382396.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210911_C7220963D0932715.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vuvoxibuwezer.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/gukobawepujaluw.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/rowuxu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/90501740547.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/jetolexed.pdfIn PDF document text
    • http://tion.hu/upload/file/40308142.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/27342736400.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/hkrnag2ru4cg5jd9tdcece7km1/givifesagonur.pdfIn PDF document text
    • http://prmakeup.com/Image/files/jupitisazosilasigat.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/xetilu.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/60396532584.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/13993173876.pdfIn PDF document text
    • http://dr-temt.ru/images/file/53723445712.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/48275133469.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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10192 bytes
SHA-256: d9d0c24cd8ea79192b559a7b6e21d34797c6fd8b8ea243032f29ac06e67e431c
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 18160 bytes
SHA-256: 74ad01960f320963f54298d544092e5baf595cd2d9b6f73f8a4a27201d045b3c
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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