Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5e7e337ae031d1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 22:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cc516534e5f8ed7ffc75dfefd573d90 SHA-1: 2a30c85864af841ce5265606879147ce63015046 SHA-256: bc5e7e337ae031d16e93cf7ee58fea02af4987bff64a04087996413cda2f261d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially 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 in executing malicious actions within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://vankouwenenmastop.nl/UserFiles/file/89137043979.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4q163ori44lga7vo9niv9o41i3/43830593668.pdfIn PDF document text
    • https://trystsalonri.com/images/file/zajiwovowuvaxav.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/sewusilezexeg.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/relopeveratikufabewa.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/76055195738.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/89422909397.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/32074933377.pdfIn PDF document text
    • https://olterus.com/contents/files/dujubivavidimopikiboxoxik.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dopupusume.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210914172244.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/zamawavimonuve.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/15520756080.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/weluzopivopogerebemupelu.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pamewodibobaserejudapos.pdfIn PDF document text
    • http://ymmicro.com/files/files/55303096087.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/movemubiboxi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/mawefagupijulozuzizomis.pdfIn PDF document text
    • http://freeorden.com/media/file/82597983286.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/98760466091.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-10-14-14-55-79.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/59078108276.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/396439133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+can+i+unlock+a+pdf+file+for+editingPDF 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_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 10896 bytes
SHA-256: c642b4bc789ff6460b5c388e1c9d2791b58559bd1b1e32a907367144ad9b94bc
font_02_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 17772 bytes
SHA-256: 7f4b4e9779cfec028c8e1b8530bf958f069b50872f4614cad5995357f2e6c5d1

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