Malicious PDF — malware analysis report

Static analysis result for SHA-256 817cbc7e3e69a4cd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 09:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c774d911428089d84cec66098bc11288 SHA-1: 401e27886047b0d0c6d0acc01f84009909c39d5c SHA-256: 817cbc7e3e69a4cd5332cfc7b269b6109a24694121194ed5a34b82b5daffaabf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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 http://psn-monolit.ru/img_file/files/16104180180.pdf In PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/vagovodijumefelu.pdfIn PDF document text
    • https://trexanh.net/upload/files/podilonumujut.pdfIn PDF document text
    • https://scalper.ir/data/files/file/wesig.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/71087142555.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/39886754490.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/50233063646.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/82994719354.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kedufepepawutakuzopow.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fizewibabopewopolubuxuwi.pdfIn PDF document text
    • http://jiab.net/userData/board/file/75106428858.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/sobupuji.pdfIn PDF document text
    • https://fratellifurloni.it/file/7302743720.pdfIn PDF document text
    • https://people11people.com/uploads/File/31019663864.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/78210633703.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/rubir.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/22383649730.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe64fb26ec---89759269797.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/lemajitekaxekixas.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16142075073fab---48683795015.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/60290879726.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/pivizaziwonubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=install+software+androidPDF 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://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_off0000b2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E5 17344 bytes
SHA-256: 518a470458cb0289eb2b12b75aacc8e641b925e222e4e2736510d16fa25a8815
font_01_sfnt_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 10384 bytes
SHA-256: d72c5b80d652b850ff0ed0ffc1be16677352d9163a98e2731865421d91bcb1ed
font_02_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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