Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3ad54f6b8f2946…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 05:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 529d576a92e66cfd21e472cee99c7040 SHA-1: a4defd658e03cc8e2d0f4ea5c33cab17081a2b2e SHA-256: db3ad54f6b8f29469517ba08bf4785b598a7bb542b75859c700e6cd6fc99a10b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting a malicious intent to manipulate search results or distribute malware. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://purofirstli.net/userfiles/file/nejor.pdf In PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_122458_9691.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/lugorolovolivowexuf.pdfIn PDF document text
    • https://best-label.com/upload/files/85853698667.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/wagolinoxakezem.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/nesazeweriwakapaz.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/37326912104.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091302510022595.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xegelufi.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/87578653776.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/59572178520.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/92705871370.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/sijukutitejejosafi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/433f0420849b5db875a22e97f93f58db/gibawujukusefogabe.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/16972986861.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/34256969305.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/79eaa4432f0588291d35b396c8a34dac/6532735303.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/96791694389.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/tazokodagixuxo.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/34414363043.pdfIn PDF document text
    • https://network-italia.it/file/woladogoxa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/paxunenozobomebixuzobu.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/siguzevalowiro.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/26140831701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sun+tv+movies+listPDF 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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10248 bytes
SHA-256: d7c4a30557a1d199e4d53186bb3170c26f703831a5a6fecf4d559801df6f77fc
font_02_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 18400 bytes
SHA-256: f5b3d7b9967cc7e963d51686040b9558544dc86aacdf92cca9037f7b806e9ba1

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