Malicious PDF — malware analysis report

Static analysis result for SHA-256 d852ba78f1497543…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 00:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6e04b7edaffa9dcf70d872277493810 SHA-1: 8e885597b7820ef5d16a95c925bb207f6666fb37 SHA-256: d852ba78f1497543f005e1805db18cb986052811ecccd538e629870587b90783
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The embedded JavaScript likely serves to redirect the user to malicious sites, as suggested by the numerous external URLs found, many of which are PDFs themselves. The presence of embedded JavaScript points to T1059.007 (JavaScript), and the overall nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aldwalia.com/userfiles/files/suxulesuluwafu.pdf In PDF document text
    • http://usairsprings.com/userfiles/file/kanagifukutalirexatat.pdfIn PDF document text
    • http://meskerjager.nl/media/files/rerajidafikeparu.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/sezaxugenenitir.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/tuwimoxalezupuzew.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/9651029500.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/48286009684.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/daxulalatozomivuvin.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/56600341801.pdfIn PDF document text
    • http://binhthuocsau.com/hinhanh/file/58926836845.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/95264584756.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/94577962201.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/21745337993.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/31105405624.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/57g0tsr9s79btorfjvdodldis3/wiwitusokajivagigebo.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/xudopijumunavujenox.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/rojomiduriletexosepaf.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/73116312191.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/liladeladowoga.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f3c95c4b---gosawiw.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/verasabotijapudidaruxevit.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/nizaxi.pdfIn PDF document text
    • http://henca.com/files/details/file/61024971121.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/zimufedizizoxinigodadedon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=new+movie+download+filmywapPDF 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_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 16660 bytes
SHA-256: 4608eeec04b40058fee6af09b4b389abc829b6a1c0f8af7534a7e069b59e2fa7
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 10536 bytes
SHA-256: 61a33c9cf7c70a12466a489e090a721a4d2191c6c10b2a15d025144ddf934efc
font_02_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1