Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd5187748aeecb9…

MALICIOUS

PDF

90.4 KB Created: 2021-09-14 10:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b983cbe6bd59b1225f1df24724dc980 SHA-1: 0e6890d2c365986f9678db4257206015f034b937 SHA-256: 2bd5187748aeecb9ef49f1b2e8bcb6122f780c7aa44d7f4be2b3bbe751f73fd8
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 are hosted on domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://esportenerd.com/app/webroot/ckfinder/userfiles/files/75882743502.pdf In PDF document text
    • http://3qlohas.com/CKEdit/upload/files/85036778910.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/47427594753.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/38756963397.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/37173552597.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/potasatanesusi.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///jakunamubajo.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/namurorata.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403da176cd0---90276138702.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/85743954651.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/8385918723.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/95877752205.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/boxajopobokogevudakuratan.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613311ab0e433---jebamuxodiwajilu.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907010747115797.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/fezurutonimewuwudux.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/zarozifutanakejol.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/72674041966.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/92107484356.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/fagexeresaz.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/92289205366.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/toxotitubumexokurok.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/21716469824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=own+movie+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_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 17228 bytes
SHA-256: 0c98b0a421f130bc8adebe9b14de2b9ece5f6c857ab3af2635a6214148f39134
font_01_sfnt_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 10180 bytes
SHA-256: 9ab56bfed6ed5a792f2db790b1e3acaa45477798d3e42197e21c1dd32efa8348
font_02_sfnt_off00014452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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