Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ad4b33dcfadd62…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 11:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65c7ab52f99e53cce7e96b296fefcbcd SHA-1: c4ca4e23a1f3f65a86034e118068c10374accfb7 SHA-256: c3ad4b33dcfadd6216f149369a7b026e2db5da40d7abc986cac8781c871d7f52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=ppsspp+king+kong PDF link annotation
    • https://cabsfromheathrow.com/userfiles/file/fugogexawasasonaxofufipus.pdfIn PDF document text
    • http://atya.eu/files/file/genafitiras.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/najudexusuvogimisesabezef.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/53719211588.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/52903516571.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142cca085b78---81027337772.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/99717012862.pdfIn PDF document text
    • http://emannsltd.com/userfiles/xitasafinuk.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/vofubimexejiviwopudupel.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908162326.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/66173478716.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/nixexufo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec15c8db6---4236692644.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/tamojamulebowudetuparefet.pdfIn PDF document text
    • https://ismart99.net/upload/files/98041740671.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/27180069696.pdfIn PDF document text
    • http://goldmustang.ru/files/files/nukazoremik.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161344f03cb68c---sumovejugopejonavexigag.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109010928068961.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/mojozopibevaxubakikij.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/xipomilojomavonagozuwike.pdfIn PDF document text
    • http://billsky.ee/files/file/85103840341.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/pebovonovelotogezer.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/55305181868.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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 17892 bytes
SHA-256: 8fec30ab0845334e4cf55431c9f2f07c8b6f4c042d75eade6378d7a87a61be1e
font_01_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 9984 bytes
SHA-256: 9e2bf5a1e934c3059ffff9e418bfdf69f234cc0be6caddac65da7712d38583b0