Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbc80fb70567836…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 22:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ed3f220427f09fa35ea1cdba8be877f SHA-1: 02eb7cf7a8b9f257d4116e9d3df4a56f940517b9 SHA-256: 0bbc80fb70567836f3ea774a4b45c234dfb873e03035b089e0d597332571ba87
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic analysis identified it as a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=i+want+to+play+subway+surfers+game PDF link annotation
    • http://yourmoneyyourbank.com/uploads/File/ximejut.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/57826079215.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/31930078845.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/47281129288.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/nerikajiximobob.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/43541570775.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/vinofi.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/5336079697.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021914520407867.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccec852cd7---tomomeneraridajojupajo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/bebowomivagoxavumujoroli.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146475d9fc14---pasovapedexetepakodixu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/sufivakunu.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/nusisokagijedodijamalab.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/70746095302.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/95034703460.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/88265579183.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/4014432685.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/jidejotitarebef.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/21503039281.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/86689606470.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/8809021197.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/2126580823.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_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 11000 bytes
SHA-256: 7d1b995bf5f90f8274ede48436215f1efd3f336e285838f89caa286410378012
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 17952 bytes
SHA-256: dbbc53a40013bb0cd39affbffd5c7f75db066dd0e8129a2e9144122159b37247
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1