Malicious PDF — malware analysis report

Static analysis result for SHA-256 a150758debf291dd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 01:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59f34ce330a6b4731288384f83a20a1f SHA-1: 62317bc0116ca3ed4b9ccfc40319be36b9cad6e6 SHA-256: a150758debf291dd7c2e8e3da3f3216098637ca100e78bbc72fbcfe0e6d1b7b0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially harmful sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=gta+5+for+apk+free+download PDF link annotation
    • http://jumpstart.mobi/ckfinder/userfiles/files/72005714306.pdfIn PDF document text
    • http://soles2walk.cz/data/file/83692346594.pdfIn PDF document text
    • http://freestyler.cz/img/file/ledorazabirogipidi.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/87234149016.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/vumezosaxepeveb.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/letakutexewug.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vobozepogenenolulofopuw.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/wetexovalev.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/tasizobiroxatelatawu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376e02216fc---4719577554.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/96086635277.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17626459737.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/bumudapikoboweleputudofeb.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/sural.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/5641949664.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/61287859370.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613518cd5373a---lawulawisi.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51179110016.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/gasitiwi.pdfIn PDF document text
    • http://sinoorchids.com/image/file/widixav.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/43050034357.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/42732540408.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210916053112922271g9fmu.pdfIn PDF document text
    • http://hbaoge.com/upload/files/nepowilawukusoga.pdfIn PDF document text
    • http://someteme.com/archivos/_20210915215855.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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 18076 bytes
SHA-256: bb4a9c249a994fb342deb1b3f2124b5bfc7a9b8440421103cc83712c047fb54d
font_01_sfnt_off00011691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11691 10584 bytes
SHA-256: 5207bf1123aeb4638abaf4a0a64f9c4f758b4a0ebcac80bc93878ff2adce9002
font_02_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1