Malicious PDF — malware analysis report

Static analysis result for SHA-256 424cf06e8fe3540b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 09:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c16828f918801d875b4be5b496192f40 SHA-1: 68fc68a1a5834b97a9d030b08374e02a387f539a SHA-256: 424cf06e8fe3540b28a9af090bec7d6d79ff21d3256ad0a772563f239f44293c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hbaoge.com/upload/files/nagomes.pdf In PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/lapivaz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/faxakeze.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/fimulu.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/vovokete.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/wunizogaxakovino.pdfIn PDF document text
    • http://stonebreaker.at/xobimovufizeroxefu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/39494714724.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210914095342.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jevazomu.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/63096496010.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/21829002642.pdfIn PDF document text
    • http://seritour.com/rsm/files/jinevizivasuwadapuvoxub.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/10893882451.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210907112419.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366acf4828b---tefagik.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/36062935985.pdfIn PDF document text
    • http://idroter.org/userfiles/files/vazeke.pdfIn PDF document text
    • https://sambelteri.com/contents/files/dibojowevibit.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/wobukovawumemapogana.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/vogogofomiramulimulalenef.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/jasolozovon.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/12093847838.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/97775937474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+clear+my+tabletPDF 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_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 18080 bytes
SHA-256: 975d4e488f9e309504d03e40bafd8cf25a28e425f9b1725ab679dbad86df7d79
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 10360 bytes
SHA-256: 78f9c2a58bf48974e36171b327d3a5d73bb67b1cfd0bc1138e945bbb643d116c
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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