Malicious PDF — malware analysis report

Static analysis result for SHA-256 2150bba047a3e454…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 15:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b830c4a3bdae7f8ae31174c2782cdbd5 SHA-1: 7a41948c1630364476f32b048cffcb5017c6cf53 SHA-256: 2150bba047a3e4542f0a0ac47c82ef4e7b17f2282d80c53f49a3eac76b86e6f4
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the true destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://melz-feu.ru/upload/52083974279.pdf In PDF document text
    • http://pizzeriadevita.it/userfiles/files/25914932503.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/naremopulilipulub.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/fisaguduj.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/49885990938.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rasapena.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/14106943295.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161378a43444be---raxotufe.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/9122537650.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/sofipufev.pdfIn PDF document text
    • https://fptica.ru/images/file/wobivimirisonijakigobesit.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/75212953995.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c8cddab6---kenejewabovutadik.pdfIn PDF document text
    • http://mfcpavpos.ru/file/godakuladamepisel.pdfIn PDF document text
    • https://felicityokolo.com/file/45007172478.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/76779116184.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/73917810503.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210904013751058.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/seweveledexelorel.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/rijefususijagukeworak.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/37141331206.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/68294615353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=roblox+download+apk+2021PDF 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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 17452 bytes
SHA-256: 0d1390aa1f040158e49537fcb1bdf50a19cdc2976d3996da35aa790bf6ff28c6
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 10556 bytes
SHA-256: ca20c272969bf46b57cc5065e71d69f23bbf72744a33c10675b6069e494cb167

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