Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2452aa2d7cb979…

MALICIOUS

PDF

82.8 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: 9f31faa78e52df5ae97b144f32433612 SHA-1: 153dee261cad990499e2020f2d3bda8cc55d7bfc SHA-256: 8d2452aa2d7cb979a9012e6273eeb04524558795522cc1a5775e74f92b26fb05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://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_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