Malicious PDF — malware analysis report

Static analysis result for SHA-256 185fbabf62c23c89…

MALICIOUS

PDF

75.8 KB Created: 2021-10-11 12:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82acb1f20586ccb65b18ec708b4fecb0 SHA-1: 85e68e1f1e8815e6ebb471a2a31f2e6e6f9d1433 SHA-256: 185fbabf62c23c894f4185eedc91e2075a81033c4dd6b4b8bfc17aa9c888a960
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=a+better+finder+rename PDF link annotation
    • https://accuratesearch.com/userfiles/file/664074532.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/kidokudusizisexanus.pdfIn PDF document text
    • http://veitali.com/upload/files/nonadonixuni.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/6176181938.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/85062840237.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98433009748.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/11122496462.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139db2643eaf---koxejo.pdfIn PDF document text
    • http://sentidoseg.com/resources/original/file/80255688854.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/zirodisoxoduwuzulapej.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/torojudijezarifev.pdfIn PDF document text
    • http://hezhengwy.com/js/fckeditor/editor/filemanager/connectors/php/connector.phpUpFile/202110/file/20211009_210008_122.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/81341399886.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/wezoz.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jovenemujogesoronazanew.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/rimumowitudiwipow.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/masalanexinad.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/90352064.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/36516832458.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/37119138412.pdfIn PDF document text
    • https://architektor.ru/uploads/file/83811498429.pdfIn PDF document text
    • https://kimcert.net/E/file/tovepisakurimif.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/55796927245.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_off0000c1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BF 10300 bytes
SHA-256: a3ff67c84246bc2fd420015d8e81d99ac76c7044a0540ce163fb2bc7eeb5fd84
font_01_sfnt_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 19220 bytes
SHA-256: 405d5201f1daa9d0848608537663c0bf3554a0e8b5e07a1c5c8b017b698cfa54
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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