Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c809097e254b61…

MALICIOUS

PDF

85.7 KB Created: 2021-09-22 20:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b47c6cd4636909c1134911d023c4499 SHA-1: 54a938516a8614008019651fe8bc6c7ae6084c3b SHA-256: 88c809097e254b61887438bfb341ed47159469ec15796987dfb33d6a26f5f2c5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one identified as a link farm. The presence of a visual download button lure, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://liceoadultos.juniorcollege.cl/userfiles/files/72456926178.pdf
    • http://aquatherm-graz.at/files/fetotuv.pdf
    • http://cobe-ing.it/userfiles/files/98405186854.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/8264290687.pdf
    • https://bodymason.com/user_uploads/files/51086315812.pdf
    • https://pindimana.in/uploads/file/16998016648.pdf
    • http://drairtools.com/ckfinder/userfiles/files/dekebirabukufeturib.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614259049061b---23401211685.pdf
    • http://kaies.net/upfiles/2109121849211373823tl1tr.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gosogoba.pdf
    • https://chasehr.in/userfiles/file/96232985973.pdf
    • http://gayaarchi.com/userfiles/file/20210902160652.pdf
    • https://eklyps.net/images/file/65058173473.pdf
    • http://edituj.cz/res/file/34160918834.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/63fb583170087e995c76c6b54a520c14/7338770084.pdf
    • http://builderall.info/userfiles/file/fokoripapufipekuvomes.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pivebukumujalun.pdf
    • http://thanhtindesign.vn/uploads/image/files/najal.pdf
    • https://bak.vn/upload/files/dusikokavofupajidatob.pdf
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/41284022025.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/bolesuxetugeboletoze.pdf
    • https://baptistfriends.org/media/2295256705.pdf
    • http://lagerunda.it/public/upload/file/77772040827.pdf
    • https://hurghadalife.net/userfiles/files/wuliwilujoxo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shadow+fight+1+mod+apk
    • https://easyown.ddproperty.com/datas/files/73936163161.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb71.bin
f89cd5e5bbed95827a9f017b0f6eb36c20bba15876591e0d53089649fa239a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 10700 bytes
font_01_sfnt_off000103ec.bin
042e5dc55b492cb57793a74b7c1eec3c6861673d61b2b8fffb05055ab3cc7d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 17356 bytes
font_02_sfnt_off000130f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16792 bytes

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