Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3e359092e65689…

MALICIOUS

PDF

80.5 KB Created: 2021-09-25 13:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7fb15b97cd46c07a6f0b7d1f0e0dddd6 SHA-1: d250515c73279a528acc4d20e3b52297d5b2f004 SHA-256: da3e359092e65689b8516ef4742b20d5e8ae0f22455f79a01cc5e125a4143c25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://crysiq.ru/uplcv?utm_term=avd+manager+could+not+start+avd PDF link annotation
    • https://www.alitec.es/js/ckfinder/userfiles/files/letatexum.pdfIn PDF document text
    • http://ranchobg.com/img/file/25400597901.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/9487459490.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/nubidasedelofo.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/vivekatesetulufeb.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/70569492877.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/3982902429.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/gojaboxodug.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/wamogesirawabu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/37461133802.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/58742354806.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/nadojatazanikoxogisan.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xijifaso.pdfIn PDF document text
    • https://agermag.ro/mm/file/86248658642.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/21792848605.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/gurobitor.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xopobuje.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349533d1f4e---9387990478.pdfIn PDF document text
    • http://freeski.hu/freeski/file/pigeloruk.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5ljkmmkhhrdgd4bkdef11121m2/47632605281.pdfIn PDF document text
    • https://proxus.nl/file/vexumorafidivarel.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/xivebuf.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/supawaseleguz.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///13265205414.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off0000ce68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE68 10768 bytes
SHA-256: beb0af67bd9f93199d729cfde9c95606e301b921dfd2bdbaf53f9a1c7cabc210
font_02_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 20328 bytes
SHA-256: fb7f80b52ca5de2c16932f9ac8e5a498b83ec3e5980df8df919883c48091de1b
font_03_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1