Malicious PDF — malware analysis report

Static analysis result for SHA-256 801be39ac324794d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 04:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57794b9475dca86019ea9a5e2cef7877 SHA-1: 22b663d2de229601696237efee073ff4539280d5 SHA-256: 801be39ac324794da4d4889f85887ef8deb7481b66e6a0f06a96a161d3914de5
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 potentially disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through a network of sites, likely for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://carshopm.com/js/upload/files/47526401121.pdf In PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nilonarekafumetexe.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/20481578049.pdfIn PDF document text
    • http://net-work.cz/data/file/xiwatafidowutokidideras.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/bumejipigumivivogigati.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/64860638507.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/33005977988.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6df2caa1f---zatoxo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-11/20210911184708654653.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/51590046386.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/88954184389.pdfIn PDF document text
    • http://yibetter.com/data/files/nijufil.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/tinodumixipopagusesareton.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/lonulijozerufubolab.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/90945048162.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/49195522432.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/ralirinivazo.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/62273236838.pdfIn PDF document text
    • http://mcutech.net/files/23399350219.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/74588355295.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/62dc805f84b23cfb21bed5a6e3829ff4/somoxakenofojazutex.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/foxuxizag.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/34552678443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+gods+themselves+pdfPDF 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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10516 bytes
SHA-256: d9e38d0c863490fc842e7e4ec6117a0846fb057542ac432e6d64fb9b15402d17
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 18940 bytes
SHA-256: 228ffc194b27e66f9a7d11e659d80b055af23fc7799b5d56736e71cde01a7cc1
font_02_sfnt_off00013722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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