Malicious PDF — malware analysis report

Static analysis result for SHA-256 8109383f53ab82ad…

MALICIOUS

PDF

65.8 KB Created: 2021-10-05 21:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b63cf46a62b6d29e056a6d771f4c2e1 SHA-1: 85e9da08d0cd3d001edef70380331e024a6f9e3e SHA-256: 8109383f53ab82ad488590b9800ffeab7fd943318e080c2c5c22f5de8596f25d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, containing numerous external URLs. The PDF structure and embedded URIs suggest an attempt to lure users to potentially malicious websites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 4

  • 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
  • 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://queure.ru/uplcv?utm_term=50cm+by+70cm+in+inches PDF link annotation
    • https://bipalisdemo.dashindonesia.com/userfiles/files/29997583755.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/65708506527.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4253e7135d614dacc6731b7c4992e5f9/judezovinowa.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/3647656781.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210921_B3147D5292539741.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/40719174104.pdfIn PDF document text
    • https://rubfila.in/files/file/30619659761.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/voxomod.pdfIn PDF document text
    • http://scro.ru/pic/file/52200850171.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/zafeganepamumuzake.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/fapamuwituvezawumoxaje.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/89515968235.pdfIn PDF document text
    • https://siroyensao.com/upload/files/tufowogibox.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/29412936855.pdfIn PDF document text
    • https://remini.hu/userfiles/file/rixixusulumebiruduk.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/38348575118.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/70339289880.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143070f9aa8b---69323672030.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/gotowesevaxa.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/3062830181.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/94883602644.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/lasisoputalodum.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pemitolukonufunup.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/sawiduwuli.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 10432 bytes
SHA-256: 334c6f32a4cdf36417f9b8d762c66a1c2f86e4ecd494fa1e5abd7cf222bb8757

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