Malicious PDF — malware analysis report

Static analysis result for SHA-256 937626295ca4117b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 14:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4f2e5b03fbfa6ec269e1143daa5d624 SHA-1: e304282301e1e989ffcdcb11db19b9bfb2458bed SHA-256: 937626295ca4117bbd0d9b9468b6b7badfd9c8c684bd699f056186050e0e1fd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document is designed to distribute links across various domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lesrimaudieres.com/images/uploads/file/87817071307.pdf In PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210905151021_579074188.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/36894081677.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/30648047993.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/27398016152.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/2549219058.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/29944383361.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/26696910220.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/xapim.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/dedolasomifonorew.pdfIn PDF document text
    • http://falerisztika.hu/tmp/rejizoredululijebafovona.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/74298328951.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/53711810218.pdfIn PDF document text
    • https://0900107678.com/upload/file/napibaf.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/78379892844.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318038efb45---26569187466.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/nawizi.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/vewavunedufubibuniruje.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/19585671717.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/rowuduvubaxiwaj.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/nulewojotoxakuzuwojeb.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/pevuwevovutupotadodod.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d19c518ff---vurumokaruxuwifuwulunot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+music+instrument+app+for+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://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_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 10888 bytes
SHA-256: 6b67f4358d7662740f3b84ba924657f9e81d762e0ad12860b3e017a5d169b9af
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 17656 bytes
SHA-256: 57eb436c78fc55174f72bf157c97c439ffe03ecd31cf70f3695a231eb8cdf62a
font_02_sfnt_off00013865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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