Malicious PDF — malware analysis report

Static analysis result for SHA-256 5246a99b0c76d1e7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 06:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3209abae41b67e53a9f1c57c5b6e0157 SHA-1: a976a01453b1ad5ffbbff6baa590a799ea8b5b46 SHA-256: 5246a99b0c76d1e739d8694f558cbbdbbd23205791d5c46f5ac004dae57bfe2d
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 hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://alfavs.eu/userfiles/file/bevudopu.pdf In PDF document text
    • http://sungwoo-n.com/userfiles/file/fepolip.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/gulutilisadupekowibumor.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/11258931843.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/98761763350.pdfIn PDF document text
    • https://maturana.cl/upload/file/xunanasobewa.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/tanumabodixuxalog.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/fipepasobufitamoj.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/91384345808.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/porudobivupeg.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914063624.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/15615962755.pdfIn PDF document text
    • http://poultech.net/d/files/12761536864.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/javagopamewomekalabele.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/fudiwex.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/wiximosukiguposawojal.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/zatulipeladofal.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/58193556060.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/10713675302.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/46550333114.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/49206691207.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/nolap.pdfIn PDF document text
    • http://boki.hu/editor_up/70379831868.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/tapamexi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/54619687687.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/18141106295.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/jifadumuguvewijizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=turuncutakipci+com+app+downloadPDF 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_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 18052 bytes
SHA-256: 2a5c55ebfc76522640095664d241de95043eed77efd98a4b08efa72aa16148b1
font_01_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 10616 bytes
SHA-256: 2815c7c277bfab2499e9a4a04446bd9aabef6e559318291a4a0d6cc3edde7a4d
font_02_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1