Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8805a884dd39da…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 13:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3b6110fc858aa392a712c5c9a43e24e SHA-1: a5e9ddbdc2d39fe49299fc197525c9279b6f38a7 SHA-256: 7d8805a884dd39dab9a9b1e0e0aa79d71dc7bcb3e7ec8cc155ab61cfb5de799a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=imei+check+android PDF link annotation
    • http://pneusmarene.it/images/file/61395804234.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/70226895322.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4b535b4a---lekinatifomujerurugakuko.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kiwoxinujupujimifes.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/92949259292.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/10635850186.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/55700141548.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/2069740638.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/30910276675.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16142dcfc48bda---52377878160.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/64116620302.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/4907241763.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/16812838938.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/5a117464bebbfffaf0fbbe271272f009.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/bofifu.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/1480238993.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/78074821557.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/borekabubujo.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/49214850137.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/vokuvunonorelipeguvubofik.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/38313828238.pdfIn PDF document text
    • http://wawa757.com/uploads/files/77536872706.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/malumubexexerolobosow.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_off0000d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 10368 bytes
SHA-256: 7cba2bf76b0f23ecb79593fba3e5407601cdd4e4128a809041c64c0797c937c3
font_01_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 17380 bytes
SHA-256: 674cf6e37375b1a01f45d8cb89d40a8a754deeb79586905550fe0eee41572e22
font_02_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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