Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ba7c8d0886d086…

MALICIOUS

PDF

95.0 KB Created: 2021-09-20 13:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b612c8b183baee347b1f0bc85a27dd84 SHA-1: 55c59092902d8f5da9ca7069afd2b28d07b66b1f SHA-256: 82ba7c8d0886d086e792bfef2aee91e56d453eab305ba64c697ec04e53f0a9e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the sheer volume of suspicious URLs points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=android+film+lej%C3%A1tsz%C3%B3+program PDF link annotation
    • http://resurrection-life.net/userfiles/files/boreligavebufazejof.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/21929098262.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///50667003761.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/baraluvivamidubavidefujor.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/pelirelugifazeraku.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161438bc58936e---8083219290.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/danubetoz.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/9635090762.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/wugojapiwozevaxuronemiwez.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/romudom.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/bafemi.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xivomowavenowa.pdfIn PDF document text
    • https://digiconelectronics.com/media/mujowobiwixob.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/badixupidikevoximorofo.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/petukufajejexan.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210916064508.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/70026724609.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/81601996222.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/fezug.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/lonefepu.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/75081590060.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/72295051740.pdfIn PDF document text
    • http://kesifveotesi.com/files/bifoletu.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/rizerezenujakofixabeti.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/wenujixipiju.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_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 11328 bytes
SHA-256: 7e374e12e18a3bef35e0d342d7a0ba44872b34a5ed394f98405b78b3d52cc67b
font_01_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 17848 bytes
SHA-256: 7ffc65315a7917eefb747add6c749ad3bfd0d1f74e3c5de8a1f539f0dad987f9

Open this report in the interactive analyzer, or submit your own file for analysis.