Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb52f6f14c6ba699…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 07:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31919d95fede55ee4796974302b27bcc SHA-1: 3728b7f10cd7262633ec5b8fa0fe33c5167e6377 SHA-256: cb52f6f14c6ba699bc4404b72a6a105c1282b7da6db30e6cbdfcc32fa38f681b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous external URIs pointing to other PDF files hosted on distinct domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://lianbang123.com/uploads/files/202109180542284498.pdf In PDF document text
    • http://tvkinter.com/file_media/file_image/file/91446585230.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/tuwikadoro.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/zezufukumemibowazirewi.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/41039012997.pdfIn PDF document text
    • http://lblussana.it/images/file/rewiwonumisuwuxutobosozim.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/leloj.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/10225330851.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/noxerukuriganevozeniloro.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/pawosutilabek.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/38590974135.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/tumodo.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/xozib.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5189e4de9---sujaxa.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/28170054847.pdfIn PDF document text
    • http://195exim.com/datas/files/54863416724.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/22123861176.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/28pv9r304ev29603oav523vfh9/45866960984.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/junugazekuzorulenevat.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/wasafuvosude.pdfIn PDF document text
    • https://peterdegendt.be/file/neriviratodosobe.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/siwiworixejemadiguwabo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/bovifol.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/259519745.pdfIn PDF document text
    • https://iwistw.com/upload/files/dojujolepenuwisexu.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/95298438269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=a+quiet+place+part+ii+online+hdPDF 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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 10668 bytes
SHA-256: d776459c8f7a65bb700fc8c8b5004f0afa6b2471c5bda64e825dc5d759b3c56d
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 18792 bytes
SHA-256: a403ad16b27286478a866cd93c7d4d12a750045a1c0c8e5f12ffdcc41dd5f0f5
font_02_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1