Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80b223fdd8e707d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 22:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5d0d2f9da962d55a44d8ecc6603f3e3 SHA-1: 5dfaf3d8d3302de2181f6a8f2165fcb8a55ae5e1 SHA-256: f80b223fdd8e707d9055db56375381a902559600f48286bca77d7f2d5ab4cd10
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3513

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://cukrarnakolbaba.eu/obrazky/files/mevijenadaxidofo.pdf In PDF document text
    • https://foundationkuzmanov.com/files/86051651024.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109130814323664.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/xenigozojeduni.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/bolukatago.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/44806360086.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/87561316956.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/69888176714.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf13c9d81---vuxakofuv.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/xitupizutekivin.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/xividuzesarozebonova.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/gapirenabilopuga.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/buwiwupedafiwetomoxusip.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/vopuvalixamanoteja.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/doxugof.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613230570efd3---20040755571.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/14539911785.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/gunavitobifer.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/69011708920.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/jesobepumanoletusewepuxe.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/44021920899.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/68939890671.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/44921991682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=windows+8.1+working+product+keyPDF link annotation
    • 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 11192 bytes
SHA-256: c13ab17a08ffa4fd5a220a9d245a57dae2984ce9525fa97c3fc597107b950cb2
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 18824 bytes
SHA-256: cd65655b4a74bf59e68593e433315f21dc866b812571f8e4a0aecacd6a3e3f82

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