Malicious PDF — malware analysis report

Static analysis result for SHA-256 90307dfcc798b79e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-11 23:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ff96674d9f3443b340b3aa911248ada SHA-1: 93b6d4b81e879412fcac3e07994fc22c05817a71 SHA-256: 90307dfcc798b79e3ee9603b6188ce8d9d8907e92dd4cb20891831d33e212c02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a phishing or malware distribution campaign. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=tarot+card+meanings+pdf+free+download PDF link annotation
    • http://vidol.eu/userfiles/file/zanovep.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/ferunuvajufezawosaxipu.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/81298739664.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/jikisiwogazatirajola.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vawot.pdfIn PDF document text
    • http://tajilin.com/upload/files/pagulewofegesevavabutawe.pdfIn PDF document text
    • https://novitas.ro/files/mudunosiwupupovolujo.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/83626619648.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/fezekupuxi.pdfIn PDF document text
    • http://gewald.ru/content/Files/refodomimolepuma.pdfIn PDF document text
    • http://gptools.net/userfiles/file/39128234667.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/41491137288.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/fudelo.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/43308013592.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/bijomumerubuziwejora.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/duxutegizobigaf.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/rurepasatovetomusivi.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/poretineketewigeb.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/31866662485.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/mular.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/82760512327.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/38357602768.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_off0000b38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 11012 bytes
SHA-256: 24aae44cb85f26b837b370c67a697ea3d1073016016776736ce5043e3609ec4d
font_02_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 14808 bytes
SHA-256: 7a3634ce77fa6a8efe798ed7506d4286bec498deea0dae07918bbe7844df5f2a

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