Malicious PDF — malware analysis report

Static analysis result for SHA-256 053806daea9185dd…

MALICIOUS

PDF

74.6 KB Created: 2021-10-01 14:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 04e7e402d2c32c2809b8c4725fb555d8 SHA-1: 74c6328125a9b8ad2b1c2963b2e076b5b22faf9d SHA-256: 053806daea9185ddba1402ff32a85f60831c240f5139a3a025070ee192dd391f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to exploit users through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=cambiar+cuenta+de+whatsapp+en+android PDF link annotation
    • http://keifo.ru/ckfinder/userfiles/files/90308857705.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/vujibabedonuleb.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/kojudivazogekobow.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210915_163AEDC9607F7CEE.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/xavubopawavokeloxef.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/tavevamidojew.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/88016686407.pdfIn PDF document text
    • https://papiratisk.cz/soubory/36805092347.pdfIn PDF document text
    • https://soechi.id/userfiles/file/16299875149.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5c7689b7---zizonoran.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/pasojikajawaxisu.pdfIn PDF document text
    • http://teplospectr.ru/images/files/dadoxaki.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0b32bbce---74831328024.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/64393634288.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/vigurozuboxit.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/rozewevokiguvina.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/vitop.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/87552225210.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/95668904703.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/tiwovadeja.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210901/16304888555828.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_off0000ba52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA52 19172 bytes
SHA-256: df91183eda304a3c623ff297f21ad1cc80b2a1b17dcc4487f8d90df18a0a9b2d
font_01_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 11088 bytes
SHA-256: 6006de54dc638a975ff0b9df464e8aac5750bca6458420637ee626cd9054a0f3
font_02_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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