Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2ddfba6e7aeaec…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 14:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28a731d537292a788ef2407973d0dba0 SHA-1: c3cf8c9c41835caa41a0eb3a3bb5c9db2f20db2f SHA-256: cf2ddfba6e7aeaecc204a9a4d561ddc095fc42d4c868d8c81c679ae3b2e35e18
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by an ML classifier. It contains a large number of embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's purpose is to redirect users to multiple external sites. No scripts were extracted, but the presence of numerous suspicious URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 4

  • 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://oniceh.ru/uplcv?utm_term=friv+only+the+very+best+free+games PDF link annotation
    • https://mgogs.com/mgfiles/file/xasibujuguzas.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/jukowirijajagigofijixe.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/75288970173.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/zegavivulozizotadasonita.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/delekixodiremega.pdfIn PDF document text
    • https://nevisnews.com/userfiles/86450144175.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/34366690729.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/37122398054.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8234534921.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/milalumudegife.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/parosaxovaduxevinul.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/71745399371.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/67805652501.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/32633072868.pdfIn PDF document text
    • http://ibb-online.ru/f/file/94226790016.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/sigejujalakozikug.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/52288384761.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/relofepugijepi.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/morufefedokinaxuzisexodaj.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/potojaxoteniligevo.pdfIn PDF document text
    • http://scpt.it/userfiles/files/32298083704.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/lemefimuriki.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/zixatewereki.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/83935771401.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_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 17252 bytes
SHA-256: 0acfaab96936e3f27becc07ab1883f8266ea5a579c7839886bfa59c626c2a1c3
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10956 bytes
SHA-256: 9d1ae9679fda19ce5c913c16442ed658c0cc9abcc9e8f38a1035f73a6020f318
font_02_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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