Malicious PDF — malware analysis report

Static analysis result for SHA-256 2672d06137123295…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3258af4ca51a4275b97363553c71f4c4 SHA-1: 9b724857ffda002cdff47304d4c90b2daf6c7e53 SHA-256: 2672d06137123295c2e71022380e281721c949e78a4bccdf04bf4c15039804aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links, many pointing to unknown domains, suggesting a link farm or phishing lure. The embedded JavaScript is likely responsible for initiating the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e731275135---47711684815.pdf In PDF document text
    • https://rajaketiga.com/contents/files/15689172763.pdfIn PDF document text
    • http://apvn.info/userfiles/file/zuvesagukijifu.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/16893863008.pdfIn PDF document text
    • http://gazetavk.ru/img/file/dibuxanexefa.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/movedibususenamewe.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/lubajopigefezow.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/73756518929.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nufaredi.pdfIn PDF document text
    • https://ratosatu.com/contents/files/90672103310.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/6590448936.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/6359523499.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ef48b1eb---xusawufiluxo.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/kasofenununenexobimibi.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/vibiputigofexumu.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/geguwelolawibumidajuput.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/joradumazozudezigum.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/53437010513.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dimaxusosoza.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021913519343752.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/98646775331.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/79707730628.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jofesirezukesoletu.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/74327957647.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109080853169643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=installare+android+su+htc+diamondPDF 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_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 10684 bytes
SHA-256: f050883c6013dcd3904e9e8039322daa09a335445fcf7db1fa27b8a631f60d8f
font_02_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 19020 bytes
SHA-256: 2837836ae667c55d3e328be0a402b21f0db7761cbf036fc411fd349498094271