Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea83bc7c3edc39e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 21:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd1bb1d28816d14cccea7d17b0a78cd9 SHA-1: 0107ef73128b4a5415e349391eafa280293703e9 SHA-256: 8ea83bc7c3edc39e8eb849878dc3d22da84359c8c38875fa814f0be082581dbf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, embedding a large number of URLs, with a high ML classifier score indicating malicious intent. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful content or facilitate further compromise. No scripts were extracted, but the overall structure points towards a malicious document delivery mechanism.

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 http://sakaryakasaplarodasi.org/userfiles/file/99035985631.pdf In PDF document text
    • http://navigator-nsk.ru/userfiles/file/monotatakevewejetamir.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/76173812326.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/83522858107.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/46314732692.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/barasida.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6bef650fc04d331b389ea0856c98d494/xademagupavo.pdfIn PDF document text
    • https://gencatakan.com/upload/file/nejoda.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/66599136673.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c96c4afd6---deragunezuxarilalakepegaw.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jewizavap.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/54489067562.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/menawaribozopigivupewokom.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/zelew.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/wujemodijabamimagodanofo.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jilaborarute.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/29090168899.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/54006295586.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/23428495696.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/dudirip.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/bupumelukitava.pdfIn PDF document text
    • http://zerosquareonline.com/file/kuderawuxujuner.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/61015698483.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/jodutafosebexugaw.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/66001562086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=weird+words+that+start+with+iPDF link annotation
    • 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_off0000c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 10272 bytes
SHA-256: a4121a5e05e3b366db570349d20ef9ddcbbcad68ee16f8e898adec550bbd0f70
font_01_sfnt_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 17576 bytes
SHA-256: 1fd4b518af88b436481467474e87f2c0859a418bf15e54a40693e7d065d6046d