Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64d6ffd0dc289bd…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d884176634843170ea9890a54691a6b SHA-1: 01df3ec910ecb39548ed4b8b5efb5554a95da74a SHA-256: f64d6ffd0dc289bd11cdb3b184816b9261a84179d744a6f93de5684c0e31ead2
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination or distribute malicious content across many domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inezorviskids.com/clients/37546/File/92517810713.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de9c2b652---1811121304.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/63344839540.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/wanusuna.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/11607329518.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/pisuvosenowesukuvigutoxe.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/29002457616.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/jugapix.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/gijisixenudojumomal.pdfIn PDF document text
    • http://yepuco.com/uploads/files/luxili.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/55018542350.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/xijezidokaxogogepuvewa.pdfIn PDF document text
    • http://maihome.hu/admin1/file/74630450140.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7415eacc4---84441729685.pdfIn PDF document text
    • http://hangquangauto.com/files/97969288368.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gowapaniralidaloluwunuka.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/19304296022.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/44098952836.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/mikefaxeliset.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/lunaperipela.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d1fde6cacceea8e89087a091861b8bab/jedazurofivibemudawu.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/25247705103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=theories+of+personality+hall+and+lindzey+pdfPDF 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_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 17184 bytes
SHA-256: 7350b752adf7cdc6ed455d7c348f6f0f11fdfd103e36828b35ca87a3ac7d097b
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 10732 bytes
SHA-256: eb6e1ebd242a0d4e10f9de7e1e3f428ca5b73352c183a7958312413a692b0c9d
font_02_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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