Malicious PDF — malware analysis report

Static analysis result for SHA-256 815b6609d0bf6b49…

MALICIOUS

PDF

97.2 KB Created: 2021-09-23 20:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2d3cda4e4ba5a6520cbc79efec4558f SHA-1: 4c06cca6d38d18d2bd008ff11afc2226dd830b9e SHA-256: 815b6609d0bf6b4988bbf50e72741ba599e325f5bfe6d2241649a1939b80db7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm hosted on disposable domains, with numerous URLs pointing to further PDF files, indicating a likely attempt to distribute malware or phish users. The presence of embedded URIs suggests an attempt to redirect users to malicious sites.

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://smidgel.ru/uplcv?utm_term=percy+jackson+series+pdf+download PDF link annotation
    • https://faresaldabbous.com/uploads/files/kosodofisexaloronukiku.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/tibodijo.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/jujenibisexosusedobu.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/pajusejuwinivadesixono.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/xepososaz.pdfIn PDF document text
    • http://chpcentre.com/files/file/xusojit.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/3907163656.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/sasedizunaw.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/detixamugenadevuwunojuvur.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/lurenoximedekopulume.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/9224688471.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/48vuv3otmrch7nsfqup7eka330/7490711557.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/61572786219.pdfIn PDF document text
    • https://phm.vn/upload/files/34608629251.pdfIn PDF document text
    • https://artbynela.com/uploads/file/pipumuvurizaruwamofu.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/tizojanenafufosigezas.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613505bd542b6---woruboziwosow.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/1247899891.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/mibujow.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/60784494577.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/nanujonadifi.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_off00011526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11526 18860 bytes
SHA-256: 4ab67dfcff99d2d8debcdfdbcbb34a47734d9a634f1141e8abfad81231a5272f
font_01_sfnt_off000145dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 10936 bytes
SHA-256: 5fa36f6f4ebf14813aa130c656f2e5e626da3d77d10f60f13c2b1011c1518d43
font_02_sfnt_off00015f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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