Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf7e12a2d34f987…

MALICIOUS

PDF

69.9 KB Created: 2021-09-17 23:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26d6930d7d3b247b22f7b5b465537d1a SHA-1: 97744ddabd2d7f467fb9e40ba6489d40ba2d7d8a SHA-256: 1bf7e12a2d34f987dd985403db3065960b420a095f53c391eaab5d2dc03eac47
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the linked sites. The presence of embedded JavaScript suggests it may be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://queure.ru/uplcv?utm_term=android+vs+windows PDF link annotation
    • http://technology-mp.it/userfiles/files/65313129677.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/mivosafom.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43005119280.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/11363834475.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/91325490640.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wewos.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/3307114993.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/mimeridefub.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/sugebifajewejibasopatikop.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/matano.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/98911275053.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/bezuwij.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161326a81b7f0a---xesuguzoxajujavugis.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/gokikaguludofida.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f805c3ecd7---26146823240.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109020522051181.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/vekutidi.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/16703278328.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/gulipanuzad.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/46537149697.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vosijunumisezadusosusi.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/95717520434.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kipumelidenozepavusekomex.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/62953335747.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/tosixedabemumupag.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/79059835453.pdfIn PDF document text
    • 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_off0000b445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB445 15728 bytes
SHA-256: 23a874121c1fc8e3096486153928b84195d943a75c062500c446f2404d0546e2
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 9936 bytes
SHA-256: 17a828780c8edf3dc1e407e5657a8eeb9e5040d72adcbc2703d096815244fd03
font_02_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1