Malicious PDF — malware analysis report

Static analysis result for SHA-256 66973a45f294c566…

MALICIOUS

PDF

75.6 KB Created: 2021-04-24 21:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0b3e8b752ae0b3843bc2b0a99ae08106 SHA-1: 4102169affe9c543ae33b7dacb2895b2f70391de SHA-256: 66973a45f294c566e2aaf7b9f6698d4578f1951228d41fe5def9429d7c0b2dbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('mezovuduw.ru') and a query parameter suggesting a lure related to BMW servicing. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The document body, though partially corrupted, contains text related to BMW servicing, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=how+often+should+my+bmw+be+serviced PDF link annotation
    • http://nosetibadap.iblogger.org/contoh_amdal_perusahaan.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/essentials_of_statistics_for_the_behavioral_sciences_10th_edition_answer_key.pdfIn PDF document text
    • http://pollsexpert.com/miruzapesonuu1o9i.pdfIn PDF document text
    • http://ontrade.top/francisco_tarrega_partiturasqsnap.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/short_articles_about_education.pdfIn PDF document text
    • http://woronari.getenjoyment.net/fuxexixubekexelurisotuz.pdfIn PDF document text
    • http://moshon.space/skyrim_racemenu_error_10f4jxd.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/makkar_ielts_speaking_2020_may_to_aug.pdfIn PDF document text
    • http://kellys.space/change_preview_handler_outlook3i8sp.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/yoga_vasistha_books_in_telugu_free_download.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/17404202773.pdfIn PDF document text
    • http://bluebadgeapproval.com/baldurs_gate_3_consoled8247.pdfIn PDF document text
    • http://igcopyrightclient.com/426576305888dues.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/rarebixovinuraba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazobelo.onlinewebshop.net/payroll_management_process.pdfIn PDF document text
    • http://wovodijulenape.onlinewebshop.net/a1015_transistor_datasheet.pdfIn PDF document text
    • http://nifiloxoburufi.rf.gd/35525697788.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/tobija.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_f34e96a715434fc392f2bb0b8fb89b17.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_e37e0ccbb6fd45409f5560f009cfdf05.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_ebab5c4363084a5e902c15f7643586bd.pdf?index=trueIn PDF document text
    • http://kiwozoma.epizy.com/anaganaga_aravinda_sametha_audio_song.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5408 bytes
SHA-256: 84e3647599382494c6697addec7145602c8cc18a90c1da07a0b930743ec6f344
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 11020 bytes
SHA-256: 6fc2c8a9f04026cfb95f688728c65d892c7a4edcdfdd49208053f32cbc21df34