Malicious PDF — malware analysis report

Static analysis result for SHA-256 1059b9c8e918a414…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 13:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a33f35d318959e8bad75cddfb22f4dba SHA-1: 52e1f04559f6bc1fedcb4166c98bb56c08b30fc8 SHA-256: 1059b9c8e918a414229ae9d70d5c2da6d328b1219e6cf487f9a6406610cd34b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=naruto+ultimate+ninja+storm+4+road+to+boruto+apk+obb PDF link annotation
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/visetitujuwodovupixikiza.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jaxuzolaxa.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/95389451201.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/85156642834.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/24163652444.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/84738790296.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ragamedixotugumatu.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/matikigujugitano.pdfIn PDF document text
    • https://songhong.info/userfiles/file/kutogamibutedaxuguzip.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090207171854.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kumemenov.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/gebusopadixefakiji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17d10cace---pomexufivegovaxuwojoju.pdfIn PDF document text
    • http://yuli-china.ru/d/files/35745306934.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/vaxezasujubafegufino.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161424efa73c03---90303028426.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/8879129894.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/migibegoradeselepi.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/53037079549.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/75636360549.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/mevinoru.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/jubijufamebobozokonas.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/fuxedazadidix.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109031703137313.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_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 11072 bytes
SHA-256: edbc68890df8317f019af5252e5523f7611621342350a3f82b9e01947a882ed2
font_01_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 17388 bytes
SHA-256: c6ee74d665c439b2cb32568f674e175618cd83bf52487c79dca9a3c8090a3abf