Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ccc59208b81a6f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 18:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1089700efdada9520e955d10a01efd3f SHA-1: 47df08b46007b315d45e94c4c1d618fd2bb4fb9a SHA-256: a1ccc59208b81a6f03969175ca781d407378ab09d24aeaffc5813d82bebe6719
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to suspicious domains. The ML classifier also flagged this PDF as malicious. The presence of JavaScript and numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://rgcsmt.org/ckfinder/userfiles/files/rexupigava.pdf In PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/67014791980.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/9632740894.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210916083405.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/wuturogoworubopobunivuk.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vudinus.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/33951982132.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/11483190922.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/guzetefasevosafukim.pdfIn PDF document text
    • http://opsir.eu/files/file/wopadugosedudusozafidit.pdfIn PDF document text
    • http://royalgroup.at/tmp/gufimenel.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/tifadunikexazox.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/8503107428.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/39741428782.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/nukegotereligutopebip.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/84786560798.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/buwelikinafisu.pdfIn PDF document text
    • http://indexone.ru/upload/file/wimitoralapufisetitafoj.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/54641785102.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/60450884270.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/51876582307.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/tigukogamugig.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/wogesi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/sopufuzadefibobaxu.pdfIn PDF document text
    • http://jck.ro/userfiles/file/xapapusodufirakuri.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/89094582078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+download+play+storePDF 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_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 10584 bytes
SHA-256: 4ed25b698a19ab23b86dc805d19d6e5bb251f52debd50ce6c030ac5d4c55efbc
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 16412 bytes
SHA-256: edccea8f18394951f25d2b786c9142f0ac0b0d39ec473520562ffb2cc2b96a02

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