Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b694cafc880d6a8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 20:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a12fbde68a6573ea6ac5d8e742651466 SHA-1: 0f38d7205ec6c2e8966276b18ace4510662a2675 SHA-256: 0b694cafc880d6a8748f246ee8d6a4e247014a8d9d2fb3621b6a21787b3d774a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution lure. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=mafia+city+latest+mod+apk PDF link annotation
    • http://peter-crooks.com/userfiles/file/99745346363.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/64658784052.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/62304934625.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/4830914293.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/motanejumanalubopapenor.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/55047209929.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/55390033082.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/51407121832.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210911142730.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8284vko1ovi1n2q645j6l0mk7m/zuvinebanujanivezixi.pdfIn PDF document text
    • http://novafish.it/userfiles/files/gabubefomowigixo.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210909145220.pdfIn PDF document text
    • https://tuinvandecruys.be/file/84438954542.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/korek.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/daxusakasaput.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/23605794530.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/2310147246.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zojitinaripogavox.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/vubel.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5f5871db---gipax.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/mojomuse.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/7689443067.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_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 10776 bytes
SHA-256: edd81f9c636c01372b7a004b983617d796107c9fa66e3cc84d83a8e99ec7950e
font_01_sfnt_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 17476 bytes
SHA-256: cc588737e1c78f658834feac1cfd63b9cb7a16032cfe058e4d51b27007a3a234
font_02_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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