Malicious PDF — malware analysis report

Static analysis result for SHA-256 0610573a19142108…

MALICIOUS

PDF

105.8 KB Created: 2021-09-23 04:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 899420e698cdd4d6f50da0b994c05eff SHA-1: 6de08b4226217145e4a0d2ea25ebc92b0e2a7eac SHA-256: 0610573a191421084a9139f0428ee8f13c13ceba46927563555b74594f9ed1e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many of which are unknown in reputation, suggests the PDF is designed to exploit vulnerabilities or lure users into downloading further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports a malicious purpose by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://topbondtape.com/uploadss/file/wuxokonatujizobetapeko.pdf In PDF document text
    • https://eledigitalpr.it/allegati/file/58450154212.pdfIn PDF document text
    • http://sissonne.hu/editor_up/40298360660.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/judiminasetiwidasukaxixis.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kugogadun.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/sodusaji.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/84867550212.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/67442895912.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/99302574899.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/620307965.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145122404b4e---zasuwoxe.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/pilefisojitapado.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/95700744148.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/rarelujije.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/poxukazufazut.pdfIn PDF document text
    • https://ms2oke.com/contents/files/40273115905.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/lenufepufeti.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/23629184937.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/bisozegimodonidufiz.pdfIn PDF document text
    • https://emmaushuis.org/pages/jasowedavojeni.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/xuwedejebeweni.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/sexisezow.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/vodemile.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/bizosaporabu.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/47313185690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+strategy+games+ios+2021PDF 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_off00013ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 17652 bytes
SHA-256: c7e32925fd4a2ef108ff453a59a830c4410ca0b7189af95369894d4594da111c
font_01_sfnt_off00016868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16868 10764 bytes
SHA-256: 34d05efa93c3c1b5beebf245a942cee74d6ef5d1bf3a612e4fc6c5459a3d2bb9
font_02_sfnt_off00018167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1