Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89fcd2f98dcf351…

MALICIOUS

PDF

87.3 KB Created: 2021-09-21 20:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b2b6dbeead719a37aa73b8ac82c8876 SHA-1: ce00b7d0b9198f8c41a165c720a974b91cd42e3f SHA-256: d89fcd2f98dcf3510ceec3c0533791d08f04af712a83b8c8a17ecef789acfb39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files on unknown or suspicious domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a structure aimed at distributing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://lyonsinn.com/nbloom/fckuploads/file/momidadogidika.pdf In PDF document text
    • http://holidayservicemarsala.it/userfiles/files/makoxenexisu.pdfIn PDF document text
    • http://abwrva.com/uploads/files/tapatizilewamunofub.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/defotevolisubutuborewu.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/tafix.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161463bc2bedd0---20542640434.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/64355643919.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/kujibanobu.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/sirikoxufibugamalar.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/29363887243.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/81447733316.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/sofodeduxojawagej.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/saxotig.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/91648498340.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/24557264013.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/tomilumifagililinagib.pdfIn PDF document text
    • http://hbaoge.com/upload/files/xedubev.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/97641969860.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/kivexuxixuvite.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/koziwitiwuk.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/21037627699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+free+android+beat+makerPDF 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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 18504 bytes
SHA-256: 868d6136886c36dd8d82e449e45ca94c66475086cc2d3a24896ce71972afc09f
font_02_sfnt_off000136d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D9 10756 bytes
SHA-256: 09c3a9759b30e461f9155b5d3ead14901c674384ef1d94789ec3ab3449d40f3c

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