Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ee55733f1ebc08…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 08:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3e658a58a784a644f4c4b4949fd3a4a SHA-1: 715f390fcceafcf0f56f3a3e7fab3c91f4a89057 SHA-256: 04ee55733f1ebc086774d5060fc38065939f8e8f25099fef4b9407839c998fe5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to PDF files hosted on various domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The ClamAV detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://anhhieu.vn/hinhanh/file/85561773417.pdf In PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/lopepizuvabofevapozoda.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/48303192538.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/mofena.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/1779256619.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/53572089331.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/76931444627.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/10586152856.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021951228163363.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/41729031356.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/pigulivew.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/82237767619.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/30740140755.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/rekopudimud.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/munajisemabupofekoda.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba22a02d4d---49852324445.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/lujivabajupilelefababebiz.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/zepuxumafegezeruf.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/wujigumoremoxawexibavov.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/ravufunexumonimedewoxurep.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/60216451246.pdfIn PDF document text
    • http://nature-revive.org/files/file/88552195995.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/17768557151.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94f81351e---papetem.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/37887884781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+movie+series+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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 10208 bytes
SHA-256: 24bc387b27d5b53415b07bf001a81f8da2bfa9435437ee5ba82f485e9aef7376
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 17980 bytes
SHA-256: acff0c8a4be3dda273fd8cc2011d9a62f802fe1e45eb7c48c46cdf4114402fc0
font_02_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1