Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8d0b06f2f1fc6e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 09:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7b571961e3411ca996487d2a7ee859e SHA-1: 0a678688428dd5652b83a40a5046fc8f9cb71155 SHA-256: fc8d0b06f2f1fc6e0805a4cc53045a08845974d16c264bdfb97edabb026c44c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=minecraft+xbox+live+apk PDF link annotation
    • http://tchid.net/userfiles/file/31220777121.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/85125168585.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/mutovadojijebu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/38g3q0pcemg647v3gtui00ibih/zudiwipelapudawomedar.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/34343361635.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/68555643540.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/fakenejumijudi.pdfIn PDF document text
    • http://husplaza.hu/editor_up/woxivobulogujosutomotiw.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b47de413---sasekisobovepag.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/28618656266.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/55880057441.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/kaporobeliruteze.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/zajuvomupofukibuwamodupow.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/vebowufixelewexabejexubo.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/54961548176.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/66206870843.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/laxemajobenemivok.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/10442406719.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/nozaxonogibi.pdfIn PDF document text
    • http://maulich.vn/attachment/files/vovug.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/zifunaxedu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/18403928154.pdfIn PDF document text
    • http://tzsunup.com/upload/86879487705.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 18600 bytes
SHA-256: 37deecf2a2f2e0bf6724650aa48b6053eec526cae63c4c966bdb3be230f22dec
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10700 bytes
SHA-256: 8b79c9a54f88eefe97ac5a2c7a833a00259dfc4b4d7e45390130182dc72a62d7
font_02_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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