Malicious PDF — malware analysis report

Static analysis result for SHA-256 346d5a9c835eb68b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 10:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac4930c318a04d51c0cbbd73300201b3 SHA-1: 58b58f6e9db365f0b9b09c3af366313ac3284658 SHA-256: 346d5a9c835eb68b9fa65914dd25bab50448d9ca71747e9f2bc04f34c6805e9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as the one found in the heuristics, which is a common technique for phishing or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=fefa+tv+streaming PDF link annotation
    • http://hugslock.com/app/webroot/img/files/benenonejaginagafa.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631818757.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/zuwanef.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/selosawoselo.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/45975030442.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/sedupesewilibixig.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/vakifufefavopibetame.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/22763367531.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/sifuvuxagepakitanad.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/83986151294.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/vuvuzuwafolidope.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/49156448901.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/93220709421.pdfIn PDF document text
    • http://stylekd.ru/files/70678795052.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/vakanedukex.pdfIn PDF document text
    • https://paperland.bg/uploads/file/94438751652.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/21232099421.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/57778812056.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/78819233451.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/pelipijuw.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadapatativovezak.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/sufabutema.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_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 15880 bytes
SHA-256: 92307e50d45a926f2b5ccb2eb8e1b109109fa0a047eb3747e6ab0fe90cb093a6
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10436 bytes
SHA-256: 3f3c705f780eac3d1c252c0d72b0e4b133175ee53059bb7d70330b41d50c617a
font_02_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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