Malicious PDF — malware analysis report

Static analysis result for SHA-256 e240057cf6919e16…

MALICIOUS

PDF

88.6 KB Created: 2021-09-10 21:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c63fa88a08a6eca79c409a04c9e2f81 SHA-1: e49aa4e6baef5d6102d65e809213f4641e416fa0 SHA-256: e240057cf6919e165d719d486e43a6e45303102c273a73a3d4d93c5ff4712bbe
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on potentially disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://schuetzenfest-hemeringen.de/ablage/userfiles/files/76650338255.pdf In PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/zimifoxomomuzir.pdfIn PDF document text
    • https://il-gusto.com/images/file/nuxaluratuboraladedafisu.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/82037909224.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/8014993361.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ripesaporelegup.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/64206706259.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tafeko.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/pagikapamewivikoxed.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/duzitogakake.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/telarupubukog.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/lomogubakudesuk.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/jimitefot.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/27957592138.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fekopowitebetogosivozim.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nalugefurewogikidukok.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/mamaxikupevetig.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/tegurawemavujaxu.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/zunesukinubijisokulaxaji.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/finarejub.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/45804485326.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/12870534253.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/22062286764.pdfIn PDF document text
    • https://intersat.lv/files/file/9896320822.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/xupili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+read+free+books+on+kindle+appPDF 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_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 17912 bytes
SHA-256: 4ebbb64f0f2eaffb0b4fa01d356d69826199ebe88592329caa152bf29fdd5ddc
font_02_sfnt_off00013b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B87 10800 bytes
SHA-256: be6a23c20760fd1be956d0b9de1ec2d25309e200831bf764ceab620db808626b