Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4b2f78d91ac709…

MALICIOUS

PDF

94.2 KB Created: 2021-09-19 00:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ccb3aef0a4d3b3df277f541541a4364 SHA-1: b9b1976101dddcde462b304d10006edaa16bf6dd SHA-256: 0d4b2f78d91ac70917a8e4bc9710cd7d1ea2e9eec3bcb1151b17aea84c58e75f
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic for a link farm on disposable hosting further supports a malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://oniceh.ru/uplcv?utm_term=how+to+write+a+good+hook+for+a+research+paper PDF link annotation
    • http://freeware-software-download.de/uploads/editor/file/kolomozozuvapob.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wapatamoko.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/19987014960.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210901_4C5218DB0F45C687.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/wubuzowewiridirolugus.pdfIn PDF document text
    • http://mcutech.net/files/fozesupofewuwolesufefeg.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/boluku.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/17656946664.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/49582378395.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/36014523535.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/61434442379.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/xekokadekenusigukik.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/35706345447.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/daxas.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/xijekep.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/75501737037.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/8068212838.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210904_104759.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccefca988---bizifedekegexapotixu.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11932869774.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/3107311936.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/subiwavelimofogu.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/43312293896.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/70954461345.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_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 18332 bytes
SHA-256: 08b8049dd5304f471877ab0fd5e240678123b546f4f357c4003c5344b3c07c08
font_02_sfnt_off000151d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D6 10920 bytes
SHA-256: e02cfce27c34eef9f8bb0498604540e5dc9732ce9928042c4304bf776977b470

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