Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d7a15da0dee351…

MALICIOUS

PDF

74.4 KB Created: 2021-10-06 00:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e7393557df847bda8aece87749eecf2 SHA-1: 67ad3563cd0e6b7a5e6d9e7698550e50f915e587 SHA-256: 96d7a15da0dee351abbd249c4f7944cc31bc03d3810c854475c00f829ac42a63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gameadvisers.com/js/new/fckeditor/userfiles/file/dovakorutise.pdf In PDF document text
    • http://artemon.nl/userfiles/file/84391821149.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/82321955044.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/numelerinujolokawo.pdfIn PDF document text
    • https://clubharison.com/userfiles/file/78605111318.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e89b4bc3---zudizuruxexome.pdfIn PDF document text
    • http://annabarons.lv/files/files/vipupuwubiwilipam.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/29114754406.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/19579063062.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/51461727786.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/22180594721.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/52593304917.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/tozubaxuj.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/kaxovodinuxokutu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/17665323261.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/15790607362.pdfIn PDF document text
    • http://haki.vn/uploads/files/70437811658.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210913194519.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/kekofexabiwul.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/senumodojijemujoredu.pdfIn PDF document text
    • http://spakimthi.com/upload/files/bubozawujagudexuziz.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/ritapaporudorajuvone.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wuvizavakewuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lady+with+rosePDF 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_off0000c1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E7 10352 bytes
SHA-256: 0411850003631606fe8cb0d750482e4376fdfb485cb666cfd91717cda9c8fc03
font_01_sfnt_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 16616 bytes
SHA-256: 6b68115b2a39d3c26b0b95d30793cfa7dce991c543bfea7ac575bd4501f18a0f

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