Malicious PDF — malware analysis report

Static analysis result for SHA-256 93aaebbca5452065…

MALICIOUS

PDF

91.0 KB Created: 2021-09-16 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2fc86e0f436336e73379ecf1c37c3a5f SHA-1: 657add5a1000b9bc05a0657c198a922514f28a05 SHA-256: 93aaebbca5452065d75a136b38984be4ce98ac24a94d6e22337a99f6ef75a714
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, likely intended to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely facilitating the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pristineleather.com/userfiles/file/nakatakudabebal.pdf In PDF document text
    • https://towa-aaa.jp/userfiles/file/wadiwumesupinexet.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/12147908814.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/kojufavofuradokezuxunigop.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905080017110558.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/gafewamex.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/gewasurikifavepatuzebenik.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/paloteriboxopoxoju.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/wijafawazitekefezajov.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/fawavog.pdfIn PDF document text
    • http://castel.lu/userfiles/files/sifasozukovut.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/11740816373.pdfIn PDF document text
    • http://naviway.su/upload/files/63983371672.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/lakobi.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210914043346.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/juragiwodegalimu.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/guvupugadugav.pdfIn PDF document text
    • https://proia.bg/userfiles/file/48190139602.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rafoferinesanu.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/gemarakuwuzosonofemiber.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161329b5a6f874---taxutopifobajizixamebuf.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/75413404690.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xolupinikavimid.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/90172184022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+does+device+rooted+meanPDF 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_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 17388 bytes
SHA-256: 77de34c94774a91f949342e239d08e77bafee41596f475962cec03ef3e25cae6
font_01_sfnt_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 10648 bytes
SHA-256: 8499f041f29ed63c2e11c59ca0da9c3e4abc0daa89071116c814d2493468a6fe
font_02_sfnt_off000145ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1