Malicious PDF — malware analysis report

Static analysis result for SHA-256 5802a748108bb71e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-24 12:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83a3b40b93586a0c44a2df6f5a30c0fc SHA-1: 3484a5de40b0fc1cdc77017a27cf6f10ff0a8d77 SHA-256: 5802a748108bb71e8cdafa03560a17cb86219a4083e6ce50f66232fe8253e175
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm designed to redirect users to various sites, including one promising free Robux. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest a social engineering attack to drive traffic to potentially malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://be-now.pl/userfiles/file/xikunem.pdf In PDF document text
    • http://ancient-theater.gr/media/file/71968083782.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/4833616368.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/puzowube.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wasejitavorixikugapolina.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/26013344354.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/pivojikegubepe.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/61025183646.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/63466236782.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mugor.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/jimuwufagemuruti.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/27239872614.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/25982978854.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/73457165124.pdfIn PDF document text
    • http://runhouchem.com/upload/files/86242733244.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046f1c9a93---bemawufemopu.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/fuwilazu.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/nixuxetekunipade.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/8353122213.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/vozijovitobav.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210918232141_fz315g.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d59d7bbc---musefokuferimigotalasat.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/88422930562.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/konawezobomutiloguzol.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/lebunurofuwibugebasif.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/rinopizutibefenebozujab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+robux+free+no+hackPDF 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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 17996 bytes
SHA-256: 1e580651443ff02bd5180981c7bafc5670b1917a1660e3e8ce5e1cbc2042a704
font_02_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 10820 bytes
SHA-256: 44df2710835aa6c41b2ea665f718612298a3e6ad9c7af0c30a41990af47485bc