Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a217cfcbcfff30…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 03:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a29a006aba30d5e6eaaa937d7753c66 SHA-1: a63993d48437d3d48e928e12e80910399b3990dc SHA-256: f0a217cfcbcfff305da4cb45973b31466796312588977a4822ab3da3c46dc1e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=beautiful+cursive+fonts+generator+copy+and+paste PDF link annotation
    • http://officinedesign.it/userfiles/files/30547448466.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/laxolazupolozojumivutep.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/78603456124.pdfIn PDF document text
    • http://parfumland.sk/upl/dapoliwoxijaz.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/98215433657.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/73914414883.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fapitepodojudedukemimoja.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/jagizajilevidi.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/98812002841.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/59058088753.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zozovorojunupomijojikod.pdfIn PDF document text
    • https://wsbtitan.com/images/file/53276598318.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/gupufejabilibejokuronuj.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a2059220---powuzupitu.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/83457860811.pdfIn PDF document text
    • http://alltechsro.cz/files/zumogebizofozorulogaw.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/92744827909.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/butidufegafuv.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/35431969233.pdfIn PDF document text
    • http://katela.net/userData/board/file/kinutigametomi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df80f30d4d---wivurimoxup.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_off0000ab28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB28 15144 bytes
SHA-256: f97da3139fc0b29fb83c9ff35267330d0355f4a4f9d0626acc29bdfec8eaa53f
font_01_sfnt_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 11128 bytes
SHA-256: daecf9e8e16ae8b9f764c4c1102e17e1dc012ccd30155a5108c30a3963e0bd0f
font_02_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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