Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe6fbf730797be4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 13:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1ddfbe796a595b2bfccc73e1b0f8b797 SHA-1: adde035c960cb3691eeba02d2225acc62f81b3d5 SHA-256: 6fe6fbf730797be4247bf46907ab5df93cbcb936d015dc8afee161bf7f652ab8
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://manhchenang.vn/webroot/img/files/67630443993.pdf In PDF document text
    • http://smcertificationservices.com/userfiles/files/rebajiwotawupone.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161317378524b1---16916798425.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/96455958237.pdfIn PDF document text
    • https://bloomeng.com/uploads/88962553878.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/zekusiwuturig.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fifenebate.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/99836734854.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/22472752719.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/93498571309.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/tupixifisaxaru.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/52910967785.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/vavonuniverakupefa.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/luzajitezobaduxinev.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/vimokinamigupomevuxupat.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-9/20210909095442450930.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/80646750870.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/40903949244.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/tosamoselozusutaw.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/gadalujijo.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/belupobip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef885a6635---80270746412.pdfIn PDF document text
    • http://industrialdevices.in/uploads/49861182439.pdfIn PDF document text
    • https://majubesar.com/contents/files/26583498226.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/90512266878.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/lukibusakexedeledaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ppt+apk+downloadPDF 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_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 18336 bytes
SHA-256: a55d25cb1cad787548c3ce37eff3e1707838664bb8cc830b5b43a6dc61c9a6ce
font_01_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 10072 bytes
SHA-256: f4403a72eabaf1222f2bab98dc1b6a2d22907518fc8f9f98c74bf34bb1634d00

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