Malicious PDF — malware analysis report

Static analysis result for SHA-256 4988de2bcce75417…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 06:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49190b23b38886a92a7c14d32ee17c79 SHA-1: 9cd60b4833d8a2ab0e9a565dd4def8f69573c00f SHA-256: 4988de2bcce754175ab3dc1d4611a522932b857921eee5fa0f1bdf61b25c5b31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://wastran.ru/uplcv?utm_term=3d+hologram+app+for+android+free+download PDF link annotation
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa325a71b---14872891930.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/lirumojozura.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/79591958277.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/powasabinodebojut.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/73482695789.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/24740768796.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/buzagizusawiwela.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/pojekiwodewepov.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/40007387229.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/fusoji.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/72433519080.pdfIn PDF document text
    • http://tipiland.net/upload/file/xifagezufafegisaziga.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/38751167929.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/vikuxotonawilokulenerebiv.pdfIn PDF document text
    • http://novichiha.ru/pic/file/voweliloxemabaxinulezape.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/gilusovufunudeduworul.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/fugogexawasasonaxofufipus.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/2524786842.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/pisakimedofoxosizukefad.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/79963181859.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/jovipaba.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_off0000b35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 16472 bytes
SHA-256: d987061aadfbc16e1ae3ab0dc5e0d67d7fff792c9c71412c2f34b06047d2f010
font_02_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10840 bytes
SHA-256: 3335c1ef386f0e818001c3eb37622f29f5c6149ee40812e8d5d622efb5c328ec

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