Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fff0e9e8aadb7d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 07:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eee656b39d10be6676c752f47ed44360 SHA-1: 0e0d8a43777951e29a52918805c1332aaa257e33 SHA-256: 19fff0e9e8aadb7d7382df9bf7703b6cf76fe3fe0aa0a8fe1f0e7150ade29d8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mayepnuocmia.vn/data/ckfinder/files/ditapipefavilesepovorup.pdf In PDF document text
    • http://liqaa-lb.com/files/userfiles/files/5220218526.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/degez.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/sudewefewetitajexerikuk.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/14869973036.pdfIn PDF document text
    • http://debten.net/UserFiles/File/37015160551.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136373cdcffe---ferobilimamu.pdfIn PDF document text
    • http://gibisch.biz/files/files/88152341500.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/zexedapup.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/suwukuwejikut.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/kinifopitakamerovupe.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/tedupazapubeju.pdfIn PDF document text
    • http://babetravelling.com/ckfinder/userfiles2/files/pesukefuribibib.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/12414867515.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/xajexutatog.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210913060942.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/24248063463.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/jobutuxeli.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3835c5354---10776310548.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/10004036903.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/52717957592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+9+pro+android+12+updatePDF 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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 10824 bytes
SHA-256: fb1b56764ab043789c70100a3bc4f510438aabe23e2dde8049fc56899fc7ed98
font_01_sfnt_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 16528 bytes
SHA-256: eb9afc1d6dbd9e6911c9f75e77c900a662f3fec95670be2167fb7a32edd8f239
font_02_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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