Malicious PDF — malware analysis report

Static analysis result for SHA-256 335296a179fa8816…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 04:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddc27458f3e6dad6fe3c0f61ec6fd337 SHA-1: 8d4cb4ab8f314b588555198e0b489b6de3120cae SHA-256: 335296a179fa8816c378fbd9264288140c2b6768afa09199dd6e48550a498be4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying a 'Browser extension / update installation lure'. This suggests the document is designed to socially engineer the user into downloading and executing further malicious content. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://banhangcongnghe.com/upload/FCK/file/kiterenane.pdf In PDF document text
    • http://aktien-analyse.de/images/File/zamagikigivuxa.pdfIn PDF document text
    • https://olterus.net/contents/files/55429227724.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/nepolexudowesatude.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210917_7F2BBD8EE2A5B4C8.pdfIn PDF document text
    • http://mdtrend.hu/files/file/13838001782.pdfIn PDF document text
    • http://metallpress.ru/files/56816776141.pdfIn PDF document text
    • http://apsons.eu/files/file/21597808389.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/labuzumavonepetuki.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/85111343627.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/pibijepefamidu.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/rezadodiriwonomadapep.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16143395d70ef5---tugivulek.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/32753670053.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/vupodakikukag.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/dimotatopu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qtuu5knumau1q1f567g4jjsm0/34348303404.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/86690006194.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/70017212360.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/zavaxo.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/bafebabapujitalemulela.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/difilatodinisoruboxari.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/67613397149.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/34536560794.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/85102435626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ad+malware+androidPDF 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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 17544 bytes
SHA-256: d7b0d19ec53e337629ca184a12ab1fbff7a3b4ae3f6cef6d2bac72b7e73a6034
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 10208 bytes
SHA-256: a7560b58125a1045fdb09a7ff7b54fab3ac649aeb5182b8b0d66c8685dea5e49
font_02_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1