Malicious PDF — malware analysis report

Static analysis result for SHA-256 3147884c76e5745b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 17:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53dad91adfbaa78cf42e42db8bdefd4a SHA-1: 0f700f6ddeee4b52677fd1449f753f58fd005ac5 SHA-256: 3147884c76e5745b1cded316b63dbbffc6fdc221ccd59590a3031a88a0f6a8b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, suggests this PDF is designed to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mchs.kz/userfiles/File/sedenukotexuli.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/58191517532.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/51202372658.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/11025385343.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/41775394103.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/81055202669.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c605a6271b---77310408066.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/nixisorebi.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/nereganavilusiri.pdfIn PDF document text
    • http://3m18.com/images/editor/files/89587366558.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914141852.pdfIn PDF document text
    • http://trivio.it/userfiles/files/mezigi.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/vafilitabago.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/41879711469.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/12769832229.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/36935815504.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/80434659204.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/73749063183.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/kufegej.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/jitopusijuzafepij.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614018557923b---91946321245.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/34400090219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=game+booster+4x+faster+apk+downloadPDF link annotation
    • 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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 11104 bytes
SHA-256: 45867b1fa6ca7b392a23e922923be98c164c12139a10a68ba108f5991937bb7f
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 19984 bytes
SHA-256: e7ed0053bbed611a085660fe14b0958ababdc98cd9c410a563d2022103104ea6
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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