Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfa2a72b6bca063…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 19:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df47624f085c372883508c56d7370213 SHA-1: 1219e0009b44fc64119e8f2843ea54429a5b66c2 SHA-256: dbfa2a72b6bca0634e9effae770800845a151c771637da95d1f849d73607e5c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://codienlanhminhquang.com/upload/files/zupudofi.pdf In PDF document text
    • http://caythuocdangian.net/images/files/54680935410.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/62450888698.pdfIn PDF document text
    • https://italvaping.com/file/79009781564.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/guguvapiluranutido.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/26530981294.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/18502105780.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/vadatuw.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613581279053f---30262571965.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/20525902369.pdfIn PDF document text
    • http://uchid.com/uploads/file/91238568549.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/sufaj.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/97088390461.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/59437734605.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/47864194224.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/xoxesawuseronalunagotavos.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///49350338382.pdfIn PDF document text
    • http://3sdent.com/upload/files/79405665987.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f993bdcce---99260234300.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/mobuku.pdfIn PDF document text
    • https://solturism.ro/images/file/22206866671.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/tefer.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/15956977626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=frontline+commando+full+apkPDF 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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 17344 bytes
SHA-256: abc600c619128f2f1e95bbed51cc851bf78e1d61c899cd36c43daf7e55582089
font_02_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 10784 bytes
SHA-256: a736cba8d7179773387e3b323f7b23ba9e739082fb5b725a38244df88ebb9629

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