Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d2835d17267085…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 13:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1580a66f89fc66b36a4e03a15197e4c SHA-1: a418c7c10eb5ee23c95a4dc70ec956fa9624dca6 SHA-256: b7d2835d172670853f6a3e49abc5f7dee5e3636717c4a01caf07a968a2b755cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://motivationandmomentum.net/ci/userfiles/files/11536378229.pdf In PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/ximamufezanose.pdfIn PDF document text
    • http://biomehl.com/images/content/files/49148078323.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ddb0c3434---36903267463.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/29782171833.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/reberafilezagifan.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/36358315505.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/59207996894.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/gefatalapolilozawokatuju.pdfIn PDF document text
    • http://seamacros.com/upload/file/xuroxowusovefoxupax.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/tizefefugurezekipaxiro.pdfIn PDF document text
    • http://kco.su/userfiles/file/14181289202.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/voxobu.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/wogekexoku.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/nelijogimejujotav.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/zalavadimep.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/19624537877.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/puvitenagipelef.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/dajerasotitunu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/49396025706.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/7313147400.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gabenapivunozefobital.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363c5b838b1---93183226770.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/kogupofeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gudermannian+function+pdfPDF 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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 10708 bytes
SHA-256: 0dd49a88b4cd13cd24ac44921bf995865ea348f3326ced2fc892808dd9b23245
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16848 bytes
SHA-256: 86d696a85c4e481a9c65bd5878d6b75efd4a723d0e40f8231c31d27ca3188723
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1