Malicious PDF — malware analysis report

Static analysis result for SHA-256 966379bb4628fd33…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 07:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9451f6d06a30ec2c2d2c7ae585894139 SHA-1: 03825807e6c89378f4e0bad3ea12b8bcbfb752d4 SHA-256: 966379bb4628fd33b6851216d80733327e9a9b1d9f939bfb5a74311c95a837c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination by using many distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://archism.ru/uplcv?utm_term=a+clash+of+kings+comic+read+online PDF link annotation
    • http://www.jacenter.org/js/ckfinder/userfiles/files/2412608866.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091805162770554.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/zenojukuvotidefituwo.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/dirujitelogawig.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/62422592085.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/tudovilelorawopumomu.pdfIn PDF document text
    • http://hidramaco.com/files/files/lugagazi.pdfIn PDF document text
    • http://gabortech.com/admin/file/pabopegezesobigo.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/wodejuviwodama.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904060134999996.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-11/20210911082355622742.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/zalulekutomulufazuviwi.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/zumifanovedogezo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce8ae6eb3b---jevigegofemavolajowotezun.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/53866015702.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/kewezoz.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/tazisotiwipugizerilusex.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/voxesowosoxexajapajakex.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16152364a9da0a---21433001115.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/40667433255.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/lezirikivexinejedijevizi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62599755275.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/tabevisevalogugefiris.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_off0000aef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 10900 bytes
SHA-256: f53383f123f51186f9d5213112c4eb7b16bdc603b66115200480f503741e17b3
font_02_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 15568 bytes
SHA-256: 60fe1730ce7d14d950e8f69ae7ed73d80bd19fd89b15d5ae7504f6eb75e17b16