Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9b47ecd32e9a3e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 21:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8eee85bb6cbc12ebecbbff2a6ea70f4 SHA-1: df2acfb5ba91d12b3c29ab0f1c5e97ef2928750c SHA-256: fa9b47ecd32e9a3e10557fa5aab5df30ea54c54a16cc3bc2f8b0564015eef78e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to PDF files on potentially disposable hosting, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://soportedevida.mx/ckfinder/userfiles/files/78797595285.pdf In PDF document text
    • http://na-bytecek.cz/UserFiles/File/tinipemebefi.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/60901484374.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/riwofilajafesorip.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/vogizuwik.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/xexasuburulogefolumoforov.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/96233986116.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/dedakabimeruwelemo.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/rexuvotawomojov.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/nitimupuxaz.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/89897992734.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/75551778541.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/416c5ba7b57fab420381162ce6595a1c/vewezebabalaminarapolatog.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/25006726994.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/labumodelunejunisemiwevup.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/ligulewewufuxafunurutogi.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/sipidokusarofiw.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210903055604402.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/18356213752.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/64037892920.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/18370283359.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/1110595765.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/boxepari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=read+pdf+file+from+assets+android+examplePDF 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_off0000b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 15244 bytes
SHA-256: 75a4923fbfdbc3fa6d2b4c5c1292b3fe7edaccf6dbd5bc34f9a205588f42659b
font_01_sfnt_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10804 bytes
SHA-256: a343b09f2a17af059410a36d3b59be3cb28ccbfc74c9d14805008723e79ef319
font_02_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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