Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecbd11173d11bd8…

MALICIOUS

PDF

91.2 KB Created: 2021-09-12 11:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 439c9720c7d6868f45cc839a7955e204 SHA-1: 4cc7ee06d5c8e392a955fd11f0c4bfdebd475147 SHA-256: cecbd11173d11bd8ad1f4c6927fc60c91e8cf0e14dcd0e551445f3e1852d99e5
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, with a high concentration of links on disposable hosting, characteristic of a link farm. This suggests the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://ecohort.com/userfiles/files/42676431893.pdf In PDF document text
    • http://acevina.com/webroot/img/files/35867051451.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/pisano.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/pukow.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/16861981485.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/63095322564.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131ab4226b---dupijopugalawovisoxarofes.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/wejiwewilazivetew.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/12994399369.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/zuvijusut.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/95506258775.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202195449358494.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/22560416467.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/xasakenelukuvunu.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/zegij.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/nodelopejenefoxuxi.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/nujezaxikexuz.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/woriworonunakakak.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rawirogosaxetagos.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a376edf92bc374beb5886f3110853b6d/30000734368.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/dasemomazetetit.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/rinuzuwile.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/dajef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=membuat+icon+androidPDF 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_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 10548 bytes
SHA-256: c90d0688e8482953eb3726e449e99403213f62d07c2881aa2bee10756c317d1c
font_01_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 18804 bytes
SHA-256: 8e783e5e7ebd5d689ae7111c2e9032332061b02e553430bfedfd6ce3b13a26cb

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