Malicious PDF — malware analysis report

Static analysis result for SHA-256 a140c5840b2ae2ed…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 12:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ad21185da6f0542752692aec95f13f42 SHA-1: 0e0ed5f4a0736ecc51a95355719a0a4c5642c100 SHA-256: a140c5840b2ae2ed193e65400682d587596764cca960401d3a682d24c3eb0fde
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lead users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=chrome+print+save+as+pdf+not+working PDF link annotation
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/43a231404fdd598bb1627037dd4d33f4/89007061081.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/pukisivezivaxokaga.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16138706a04fed---57976962853.pdfIn PDF document text
    • http://parilka.by/var/upload/file/27346233940.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/gijopifiti.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/57849620093.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/55673390644.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/1103588888.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/xevabudisutuwamekibuzikox.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/73684107894.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/gawoxepexawedoba.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/fonizagukuxigadab.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/gojuki.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/67836165618.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/wadogokex.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/nitanerukaweve.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/187843203661333931947af.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/4580269422.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82495004357.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kifokavarupuwike.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/tesejilubulonotudiwata.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_off0000ae67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE67 11176 bytes
SHA-256: cb122d571b5a61d7d84ea3b7f00d8f111bbf215c6ee9b4067939742a757a5adb
font_01_sfnt_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 17152 bytes
SHA-256: d9cbf1cbf2d0f8974b9b2bdff6b225a5e8ac68a5cd51ad9bf8727184328124a9
font_02_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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