Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d6f58c1951722a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-25 04:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63dd8e719a13da423b83fb9258f76f4a SHA-1: e90e4fd2006b841c79d849e49d03e92d866bd441 SHA-256: 09d6f58c1951722aaa5d6c619af9b7667fa96a972be8abe8dbcd83994dd4c639
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The high number of external URIs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or redirection campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sostrevalli.it/userfiles/files/nogiwonipofabovo.pdf In PDF document text
    • https://capitalsyndic.com/userfiles/file/56434591546.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/bivuxakofowuxaveboda.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00a443837---wazokawu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/dumobewabesu.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/xadakigepazizovofarawe.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/tixexarake.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/39990639705.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/45013405511.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/rinewaxusikuzaji.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/somigavevabusizipaju.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/togisodetudotiganox.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/21383039256.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/4598556493.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/61010348506.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/36799181694.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/36291808395.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/liwifarifemewonimub.pdfIn PDF document text
    • http://land89.com/ckupload/files/pakemukudatubinos.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/rofufukagofak.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2c2020bf2ea87ad7181035059b513877/pumobunusawoja.pdfIn PDF document text
    • http://zgic.ru/!upload/files/peludamoxe.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/48197799679.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/loresuraxora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+antutu+benchmark+phone+under+20000PDF 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_off0000c3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 18812 bytes
SHA-256: 41e0bf541a68400c6472d3ba77e5a74a9814c21af315411b1057db93c95bba6e
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 11268 bytes
SHA-256: c360800b8be0cc913fe9a7acc39fcf81b69b34a438a77e4d5b4b88498993f00d
font_02_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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