Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8403001d109490…

MALICIOUS

PDF

87.2 KB Created: 2021-09-14 03:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a274063d04d0f633fbe559c10944589 SHA-1: b0585303da5e589016e7ff6358d7e76a6d087bf6 SHA-256: 3d8403001d1094908b31aedee27258c30485f88cc89eff6cc9545b735babf2a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://synerhu.ru/uplcv?utm_term=schriften+app+android PDF link annotation
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/liwaj.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/32852877305.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/37760970781.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/75878282907.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/82723949224.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/73227851515.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b48711940---43931060630.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/74657694952.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/18427405002.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/07051909470.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vuvapotadusarozejobokinuz.pdfIn PDF document text
    • https://unitjaya.com/contents/files/sugomosevifipesudafaxob.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/kabiz.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/9058944942.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23072721749.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5154b9cc33552e563453a0e3ca4416d4/vimimi.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_115CD5A2E0BDA8D9.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/dujokofafobimotunejar.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/puniruxux.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/bivejotinusikoxovuxor.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/4628279323.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/zewukewet.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/lusowefiravutelosup.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_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 19624 bytes
SHA-256: 681b93e80f7eeb57d5d3cbae5dd3f17c58902a222323ec7cbc860651d8d7c664
font_01_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 10576 bytes
SHA-256: a31d9c4fa6d4bf1ea44130df9176aadc824fefb84e4947cd27c79272d071b85c
font_02_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1