Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d9e28a88b3f3b3…

MALICIOUS

PDF

85.8 KB Created: 2021-09-23 11:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dd60c190dd5d4e7b2178e00cbd242b6 SHA-1: c164515c256779179b3f0864fda0f9bc95ee8229 SHA-256: c0d9e28a88b3f3b37a69d42ea87c5ecacaf107c77d2fff94f8ec20941e16b67e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous external URLs, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit delivery, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 5

  • 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.
  • 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://er-cardiff.com/eurostyl/photos/file/22919254533.pdf In PDF document text
    • https://oxi-dental.ro/imagini_ws/didajesusukibej.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/regifavewitivawusiwinef.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/84232273506.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/37318964979.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/tixelutinaganejuliwuvim.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/76722893943.pdfIn PDF document text
    • http://enkepharma.com/upload/files/651043586.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/padis.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/jorafu.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/gujururujogebaketukovid.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/loximoraxugajumuxirej.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/kobisisababereteveva.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/fasabawekufimelepesevu.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/34701118917.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/buzikigakujizubo.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/lixulikoluwujogarupuvapu.pdfIn PDF document text
    • http://dhf-china.com/d/files/biruvejigorok.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/12366769345.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/weratiliranezu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e8664e6b6d85c0580aea8f9a6ce7b03e/zozeridimewumiruka.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/30193983959.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c332629c---29324120829.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lodidaba.pdfIn PDF document text
    • https://vpmemorial.net/images/file/27742928284.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/75238503691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kaithi+tamil+movie+downloadPDF 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_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 10388 bytes
SHA-256: 14e34ab0ccef88a02dfd6dcc3a174df0c9398244e4291c48ac23695f70d06f36
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 17828 bytes
SHA-256: aae4f8192f21417937c4c719194d2f5c8fdcd0486f5a66245c9b968242f0982c