Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd2115d566c0ce…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 06:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c41b261be4278d4bd8d6ec7402de3f8 SHA-1: 590b030d6e1ce5330e5d7dfc77dbb259136068cb SHA-256: b3bd2115d566c0ceea6353929132f3b85d96910e0dc49ea6bcfc92c78783d92d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is designed to redirect users to a large number of distinct, potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://taiwanquinoafamily.com/shopadmin/upload/files/44531519191.pdf In PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/zufamugedupetiwafaga.pdfIn PDF document text
    • https://kaimano.it/file/kagoxipagefofobo.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/temanegotol.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210901_105015.pdfIn PDF document text
    • http://bankerz.in/qpic/files/30626833392.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/84869654487.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/rabuvopixubixiwezogizimok.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/galupagitu.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/21451980848.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c5da2bd2a---10114998181.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/jitevesorudobesaganubawe.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/somapekeli.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/fopokogireg.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/9449496217.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/supikutibulebimu.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/21091318656.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/gowopebas.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/95243007768.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/74366274046.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dcgv42tvfc7mcm9atelt0q51u2/43253076845.pdfIn PDF document text
    • http://orthodoxnews.us/file/82307391243.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/luxalubatiremokosikuxezi.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/80015557097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+recall+text+messagePDF 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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 10796 bytes
SHA-256: 58357f9d835f3845556b90a2c10c2b846198a5f4e690af5536ac05f0cc6e418f
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 17616 bytes
SHA-256: 711f7626495b4d8f239b6392ad19ce81e82523d8c128140a8306febc38d30b92