Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69177bc042c628d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 17:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49170ddd736603a49e9cbe9c8c1d45f0 SHA-1: 8a9406762301e0d16da63a58708f9302b5af3ab5 SHA-256: c69177bc042c628d167e6095df97d0c6e33fa0fe41cc3acc181784e4e381c876
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=arab+health+2018+exhibitor+list+pdf PDF link annotation
    • https://glaskunstcentrum.nl/images/file/pufepus.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/mexuvexaboxawagujeseke.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138a57a59f25---felugekumagajofapowaka.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/2887295155.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/revupuzodude.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/reluvogoregig.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/6055481459.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/duridowametavidowike.pdfIn PDF document text
    • https://duel.pl/userfiles/file/zufagis.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/73585341262.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906182746.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/zumule.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/negezatulevevigireg.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/52495699250.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/podos.pdfIn PDF document text
    • http://djpress.pl/Image/files/19613019051.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/xadorebijodolumesonopal.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/xijavotulebuxez.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/kuxuzisozixububokeg.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/52370996434.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/worinituvibisabelufewafu.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/82691458568.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/68843884310.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_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 17848 bytes
SHA-256: 8bedc980435370f39066a069f7ed595a065173f30d3101e654b5f341f0b558ac
font_02_sfnt_off00013b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 11216 bytes
SHA-256: ef92e6752085be6816536d7792a1ba743cf2865e531c56934679c2d024d5c03e

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