Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c18def7cb52b59…

MALICIOUS

PDF

70.3 KB Created: 2021-09-22 12:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 614815d95c03b6a33490b827c8c3cb52 SHA-1: 6a17b9c3f08ce98e2fc0968ab19a1a9a29701d07 SHA-256: 99c18def7cb52b59ec68a0e4fe0940708711aa15db3e9582e8592e3d6c6323bf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a likely intent to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its nature as a potentially harmful document. No scripts were extracted, but the extensive use of external links suggests a phishing or malware distribution vector.

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://drafthe.ru/uplcv?utm_term=tom+and+jerry+movie+2021+watch+online+free PDF link annotation
    • http://pooq-design.com/app/webroot/fckfiles/file/62611140091.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/burunasu.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/lelopaxaradelaleru.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/jabokilizax.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/timiti.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/89314311756.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/rurudodux.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/lusivonuti.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/watoxigasuvo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nodeze.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/fazixezavegaxateguz.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/fosafoxuzadutumataraxij.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/woxapevetu.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/kilazosotisazirafiregiw.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/tifepugalizujaseligugoz.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210922141411.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/roletowe.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/nimefevonanosufuwaxug.pdfIn PDF document text
    • https://webhosting4.net/media/file/22745719002.pdfIn PDF document text
    • https://onwater.my/uploads/file/86958868657.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/51583686514.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/zesewubabajoritixedib.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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 15556 bytes
SHA-256: e88f9e0d76b625b10082697fa9436075c50b0a040633100358a48fc7e58d847d
font_01_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 11224 bytes
SHA-256: 3969d5efd46d691f16754f12daad24275ccb9dce4a69bddeda6293bc1ad489d4

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