Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1921de08414160…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 05:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 076e21557ac9d9ee6d0b0197e9ee7c2d SHA-1: 2ae03f23831330b986ebbe1cae052a692533b186 SHA-256: 2d1921de084141607dbc2d705669721a77d43d43f5133bbe2e7cccfee2ca948c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, and ClamAV detection as Pdf.Phishing.Trojan strongly suggests a malicious intent. The embedded JavaScript is likely used to facilitate redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=mod+apk+dream+league+2021 PDF link annotation
    • https://chupwo.com/editor_upload/file/40449529492.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/mapevoruwani.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/milodevilukifal.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nijifavekurijadelatiwasi.pdfIn PDF document text
    • https://podimercrm.com/img/files/rokowinew.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/beziron.pdfIn PDF document text
    • http://ergakiland.ru/files/files/gomexonuviluw.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/8463301030.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-13/20210913215446598842.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/99801943427.pdfIn PDF document text
    • http://space-edge.com/upload/files/25783284856.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/xetexulutilugabif.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/48228799863.pdfIn PDF document text
    • http://hidropro.hu/upload/vokesekiruwirusuvazufugu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364a6057158---98795985021.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/bitefulefit.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/3740263132.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/fukogunitojevopasakus.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091104251473499.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/puxinunapuwifuvamijawoj.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/22649891236.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bebekuzagaxupelakiwek.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109111910485834.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_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 10752 bytes
SHA-256: 08adce8737dba2f4ba83c11e9ed4495991a92694c1c7259e2a75f09fc5c427be
font_02_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 20352 bytes
SHA-256: cf4f895c571ae7a3defaff2e54c816f0d558bf2723840096fcc1c3e707c17398

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