Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f2cefde9057e0d…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 23:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4abb55f7bb7d488cc54946d6dd360bda SHA-1: c6d470b2bf67d89d10530f550a82bec126aabc3a SHA-256: 30f2cefde9057e0db8e939e35fc1898126c47eb1c999e8978fc5e94fc864ab98
74 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 PDF files hosted on disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://kronospan-mofa.hu/editor_up/fotinuvenutoketurad.pdf In PDF document text
    • http://sky1981.com/asset/uploads/files/28244425869.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/75664107080.pdfIn PDF document text
    • https://kulittelor.com/contents/files/30405905632.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/33592017501.pdfIn PDF document text
    • https://ccskin.com/geektic/files/dovapolewomemuki.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/34569801315.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/watom.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/87539993055.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/82664361739.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/18372649838.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/totiwijusona.pdfIn PDF document text
    • https://bczenekar.hu/files/file/jiweke.pdfIn PDF document text
    • https://adikkedua.com/contents/files/12936199506.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/wonebidudax.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/82437420110.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/nileligasurivotixexebe.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/83320446616.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/29283513931.pdfIn PDF document text
    • http://salespate.com/userfiles/file/fejinuvemuworufav.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e520c31402---360161872.pdfIn PDF document text
    • http://erdbau-rauch.at/57479351865.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-06-09-50-11-93.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6df6de61b---razuxenefeka.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/xikenufokowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=music+paradise+apkPDF 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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 16744 bytes
SHA-256: b5d6b4cf74c4396bb5cc46215f5551546343f1eeb91326ca45e55df21ad8d635
font_01_sfnt_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 10324 bytes
SHA-256: 5428c9c809dbab5a262f77626bebd8ae672c6f049a5fa7f572281cff39a9cc81