Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce6a592eab6c4bd…

MALICIOUS

PDF

80.8 KB Created: 2021-10-20 14:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d9de76163c77b63663e072d45a9a87f6 SHA-1: 834a1168f9935487f61ac6c5818387cead513c2d SHA-256: 3ce6a592eab6c4bd666370ea383f83df830126705dadd7be7ff5d1c1c0d18795
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://rh-h1tapi-turbo.com/contents/files/puduka.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/litavidipuparodowexa.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f675780c6---16313902337.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/79381602221.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/2972151270.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/99604620105.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210919015358_a293YW51a3VuYXh1bWluZWw=.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/57183164304.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/rosojetalotovakelo.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/95994547359.pdfIn PDF document text
    • http://santehnika34.ru/images/file/59666370158.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/zinekidesovanatovep.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/31076455469.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/99500810099.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/37962880333.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152f8ed616cb---resixagizobuw.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/55495016444.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/29857946261.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/32916727276.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/46890098898.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/wugawezudi.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/gawibovakanuferal.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/15716272392.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=rental+subsidy+meaningPDF 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_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 18248 bytes
SHA-256: bcd670b977173c0bcc24b485b5a8d46b4fb92a6c61fdc627fb1bfcc3d4760e26
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 10772 bytes
SHA-256: 097f4ec67a443f8516e669f992a1b0924082393049be45beef55c6fc30bc94e4

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