Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85bff96e9b77ef3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 08:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f8efd4f576faac398690c34bcf470f45 SHA-1: bbae231bd566afa514fff9c6109e3b59fc04bbd5 SHA-256: e85bff96e9b77ef33912901cc4d784c5c4737cee0e7ecef3ab06eeb80f5128c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of PDF malware often involves exploiting vulnerabilities or embedding malicious JavaScript to achieve its objectives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137db552806b---485415552.pdf In PDF document text
    • http://wefocusdesign.com/upload/files/82955261123.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/fojovufivabekofe.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/fijamibiserulop.pdfIn PDF document text
    • http://519pf.com/userfiles/files/mepuraluxoxav.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/xesuk.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/lebefoxijo.pdfIn PDF document text
    • http://vhktn.at/images/content/files/83785021613.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/9929737243.pdfIn PDF document text
    • http://tvsporedi.si/vsebina/kajukirumemadaragalolel.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/lajoroxurujibapuzobam.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xiratovozixasikisev.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/sovizowuzez.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/43761328887.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/simugonesagububugazonu.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/23353565862.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/62201482571.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/87240246274.pdfIn PDF document text
    • https://n-tlg.com/files/file/towesonumetepafizi.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/56596891148.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/pevikasuteliboxadu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1e5f8c2ec---wepapotarodusogexopig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+ps3+redeem+codes+2020PDF 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_off0000aef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF7 10564 bytes
SHA-256: faa9c6cce3b08bd04c442793d4ca7402f3cd0af9b3d03658bba7493587a206a5
font_01_sfnt_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 17248 bytes
SHA-256: b032a5bd2e2f6aefef0c5765238c4956e24e6945b2fc8436406c546327c6ceba

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