Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a568b8154f22227…

MALICIOUS

PDF

72.1 KB Created: 2021-10-06 02:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 776c6fcbc7dd86b59454131060c21652 SHA-1: e3cfefe6755532aa7aecb3dbfde973b20b465010 SHA-256: 5a568b8154f22227de7ad571baaeb44135d5417934522d9d590e00c3a470630f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chhattisgarhsanskritboard.in/sharpinstitute/images/files/78809892499.pdf In PDF document text
    • https://szabolcsipeter.com/userfiles/file/7280203530.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614625ee82405---mesizurawelu.pdfIn PDF document text
    • http://dip.natura2000.pl/imgturysta/files/bagupili.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/17252123602.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/8e111961e66cac3072bc2afb3e7a6c7c/logijotavusajuwigupaz.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/zuvakowen.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wapiwagamadekene.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/belafimusijadififunenes.pdfIn PDF document text
    • https://garankuccu.com/upload/fckimagesfile/6c554c1b1ced9cea44313845684a882a.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/ditumibatev.pdfIn PDF document text
    • http://viorina-deko.com/images/file/gibirusosijoti.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-13/20210913020041609542.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/kebilolof.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tinefodufugodo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021100218314173499.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/zabugenukisudopuxorala.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/jukarur.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/setovi.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/17854092859.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/bodalewodorip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=inequality+of+wealthPDF 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_off0000b9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A7 16128 bytes
SHA-256: bfa7771b155b51c8f3c883ed8e4e8f2ee71a29ad82d9604c68d8eeca725cca82
font_01_sfnt_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 10440 bytes
SHA-256: 4e54b0bdb750dfeca7871dbae81cd360f8a43ed2cf2eb7f50a5bdb5a3361228d
font_02_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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