Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ebd7f31acafd41…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 17:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 858b9f7323af735a8aaf5df2ce8b2b40 SHA-1: ff50dfcc591333f7aca55fae3eaed22efa83c012 SHA-256: 04ebd7f31acafd4145c90cfe6677b14186171ab6d7d985fb37aed7d12012395a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading unwanted software or further malicious payloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=internet+download+manager+crack+free+download PDF link annotation
    • http://quesnelfoundation.ca/userfiles/file/zarunubavit.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/80012599269.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/kuxarowimimunirekazupuxo.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109092328381801.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/vuvifabasogonawuxu.pdfIn PDF document text
    • http://www.programasaudetotal.com/arquivos/file/tedoniveraso.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/86264725194.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/27484700577.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lewaforetupujupoxewuzam.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xupujetidivimotuni.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/61168704360.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/68811553576.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109111019415427.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/48727222324.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/refatajegewatuwipunuza.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133255d52a70---jifuxop.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/65719128972.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/8578693778.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/jabodemevovanetezabarut.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/toxasejegixexixofiretof.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/fibarut.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/46421198479.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/63542914185.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/91101126485.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/wegevodizokazexetuwidajof.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e0e822f4c6f7c2f11227e74ed47e9736/babujexufanenozoloxo.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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 17552 bytes
SHA-256: 54e8ee7b79b71019c53efc28427679fd6edfc025a3a32a3e1e0d90330b0a09e7
font_01_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10688 bytes
SHA-256: 9167645a7ea860595c24aaaf8d95007ca07a76b4a41805937ffa162db19f8713
font_02_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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