Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9859f35fb49f02a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 03:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e48e24ddb043366e8a08057b891e25d9 SHA-1: 417ebe9cf8e6475b7dd889615204ddcf00d06079 SHA-256: c9859f35fb49f02ab4e122bb07f137a8de3c8bf9d80e905efc3b3209f06c6a18
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links, likely for SEO manipulation or to redirect users to potentially harmful sites. The presence of many unknown URLs further supports this, as they are likely part of the link farm infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://villalapinetafavignana.it/userfiles/files/32861243409.pdf In PDF document text
    • https://idealist.ro/userfiles/file/94127859962.pdfIn PDF document text
    • http://asqcert.net/files/files/jisun.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/67560943140.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/98626157045.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210901file///39281214816.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/rifaperidomosofaxinik.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210909_015132_191.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kilodez.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386b3082ec5---64159003755.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/kuvofu.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/doxekizirajafeweje.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/612edd63f03ec.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210909120238.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/18259928443.pdfIn PDF document text
    • http://yuha.be/_files/file/99726045479.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/59702171378.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/25258470369.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/25608425290.pdfIn PDF document text
    • https://auto826.com/uploads/files/106273896.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/13321002301.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/bawewax.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210906_9A7D522118CFFB99.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/5604212836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adult+tv+firestickPDF 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_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 17600 bytes
SHA-256: bb9f92721b6c183aa9de289604c95d09a7b47c39df9eaee506381de558a41948
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 10320 bytes
SHA-256: cdbcde82e01d01c9efb8d1f11a658dab58d8365b05e8b96331a5c03e910f31cc

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