Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8abdbd3dd8243e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-08 16:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0088826123f050136acfdf8d83415ec1 SHA-1: 5476859149f93c833c19385d7c634ebd9b4251ed SHA-256: fd8abdbd3dd8243e42febe1bfb0311b458925838d298c6e87eb5a042876232ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by ML and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=dieta+para+ganado+de+engorda+pdf PDF link annotation
    • http://dakhoanhanai.com/images/files/ludupilomolugo.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/vubosakemelerogumikipamo.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/49805072744.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/37477965090.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jakebojaxuzitewo.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/luvodajuw.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/fasuvitipi.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/91145303835.pdfIn PDF document text
    • https://bloomeng.com/uploads/lixem.pdfIn PDF document text
    • http://netart.hu/userfiles/file/32732297625.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/91730740453.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/30627521105.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/gafitanepetoda.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/52408655718.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/gokotelaf.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfc96ae11---81562451641.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/seves.pdfIn PDF document text
    • http://newshop.jp/archive/file/40072782421.pdfIn PDF document text
    • http://vhshf.de/File/58763578970.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/73808907262.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/dabumilij.pdfIn PDF document text
    • http://araonline.hu/uploads/file/55910312491.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/padukupekuw.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-8/20210908072141684753.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kekufexomefipulo.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_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 10460 bytes
SHA-256: 0874160a73133a4d7924b0305cae47f5d32a85893a28a2b86ba5676e6f798d66
font_01_sfnt_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 15344 bytes
SHA-256: fc3d14a141a9829031841cdad63c33f3f9b334c93e88409bd5b2bbb58a024f95
font_02_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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