Malicious PDF — malware analysis report

Static analysis result for SHA-256 284802db74c86a5f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 17:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a19d3d7289c5882f91de753958709e6 SHA-1: 3c168877ab927eaebf558e91181c19d03d12e6e0 SHA-256: 284802db74c86a5f287667a89e83060fb21553d64a349af2993540ed9e262e65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=triangle+up+and+down+symbol+android PDF link annotation
    • https://topconta.ro/userfiles/file/xagupatagoli.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/16170079372.pdfIn PDF document text
    • http://bushurov.ru/images/files/jexururivilo.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/81872643736.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/tejaxudevavuwanudefur.pdfIn PDF document text
    • http://sinostandards.net/upload/files/mivobimigiluvunaleresatox.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210915212136692.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921045102836.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/gowotafadapomevusedotipor.pdfIn PDF document text
    • http://elma1.ru/!upload/files/85316079128.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/ratejaw.pdfIn PDF document text
    • https://semut73.com/contents/files/lunofevaxinofokolaki.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/41869475508.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/23011810910.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/69723050065.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161434d4611748---47271606647.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/3573975788.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/famipufexofuluketa.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/revabazonenaz.pdfIn PDF document text
    • http://tencanpowder.com/d/files/57883296604.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/71053189355.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xiludujiserokalotasit.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/kexowemekodomepa.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/77138300279.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/lagavopokogovafom.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_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 18712 bytes
SHA-256: fa7af21786eb8839649203eee58b24b8e1a016f17e4733db7f50897782bfa5eb
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 11040 bytes
SHA-256: 6e59cd87ef68fa7646494f29b6097ff2de6697774050d24b93f1939bbdaad76c

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