Malicious PDF — malware analysis report

Static analysis result for SHA-256 e495c02e257e9ed7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 09:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3d684fe4a1706e06d3b34d252f4b16b SHA-1: ff2203c3e79b3cca8049470562e2bf56e4de62b5 SHA-256: e495c02e257e9ed744fb8dfb33348d91bbd6d9b2f8fd3c6ccbf098b37a4c719a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the document's primary purpose is to host a large number of links for SEO manipulation or to distribute malware/phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=app+cloner+premium+mod+apk+latest+version+free+download PDF link annotation
    • http://sinoorchids.com/image/file/zexepopufimirewikiwapada.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613618dde64aa---vuwobezapupakupobef.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/semixetukot.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/85183219310.pdfIn PDF document text
    • http://fohow77.ru/upload/file/xarapedafedixoj.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/18876252351.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/26966993591.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/99770240832.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/gegobogitojo.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/1607124184.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/durekenunaloma.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/rekipobafapof.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/zilufuvunididuwew.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/94698324314.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/8582732410.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/44427769565.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/60d3697d8796500f6bbccb691cedc2f3/xibiwegubopinutova.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/jutabawewimo.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/guganulomeno.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/75762485708.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pepulitupalubaliwaxod.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/93336840507.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/mukomu.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/13569142960.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kovomasubogapelara.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909011613.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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 11104 bytes
SHA-256: 39eccb35b77b4aaf0aec113ba5109dc07dc277369eb8273f7a95764e2c24c984
font_02_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 17796 bytes
SHA-256: ddbcbdaf847a38dbeb130b60e0643cf0c56a8010fb6ac92bd88811f6257f8ffc