Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c726e4c74a2bfc7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 08:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 055cb4d9ba769a5f1a613b853d59bad2 SHA-1: 2743cc066a583a04be730c03f2e3a73541068444 SHA-256: 8c726e4c74a2bfc710d67e8e9aef0903604e89e1141ff2dccfb6a8726c0c77f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious attempt to direct users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://baheth24aqari.com/ckfinder/userfiles/files/dawekubimizebiroluri.pdf In PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nugoxixosagib.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/21483146139.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ihjnh1kmohvj737fgdtil6o58bb2skci/21762622013.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/sefop.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/19119705436.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/sizagilezejulifimix.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/2505332015.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/kigurukabuzazawenelede.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/golobodesobawiseninul.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/38488864240.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/46021384807.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fc24b3e19cfa56b4d5603094e16e46ae/xatakelegefopuvudo.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/potalefigiputuno.pdfIn PDF document text
    • https://ijpdua.com/contents/files/potavanutufip.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/13653953695.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/depato.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/76144988298.pdfIn PDF document text
    • http://hrudolf.com/userfiles/wokukoxor.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/tukoviluxufotopodumatati.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/rozejulamabidadajupigorek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=figurative+language+answer+keyPDF 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_off0000acec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FE 14816 bytes
SHA-256: 4e655e9866e5579a14430c6d67bff25273bca12bfbe46e96a6bd7be37a4bc7ca
font_02_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10596 bytes
SHA-256: 91242151753dff471d15eab0d7f3ba9ed5e7392c4c410931e2465125d6803978

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