Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a88c939358a767…

MALICIOUS

PDF

71.0 KB Created: 2021-09-11 16:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d182d0953163a14708c38104387cd6d1 SHA-1: 25809fc38bc78c32bfe1c87c24ec83a0e2fee534 SHA-256: e0a88c939358a76707ab68f9aa23fe8a7f389436170f2ee88c168dc56dbf9c42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/bibilelapukodunol.pdf In PDF document text
    • https://bvphcn.bdata.vn/upload/files/fipaliveke.pdfIn PDF document text
    • http://farmina.ru/uploads/files/19361501718.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/56184412123.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/32821172405.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/dumeraxoxo.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/pibakuremakigug.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/17330225323.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/92613057002.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zutasax.pdfIn PDF document text
    • https://geloracinta.com/contents/files/kedagabojogekogubopa.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/noropujugor.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134070f69f42---13154866826.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/kijoto.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/53769968845.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210902214716_xrcx20.pdfIn PDF document text
    • http://boldogelet.hu/media/29302843743.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/9444401381.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/zutewuvobupofo.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/79965250952.pdfIn PDF document text
    • https://seger.cz/userfiles/file/vosanogabukekamagozaribad.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/7471688404.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/927ac9577021d345aef1680e261ed56c/98278140708.pdfIn PDF document text
    • http://espwireless.net/uploads/file/zokitexudexuxofirenefu.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/rerebesoritewolal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tattletail+game+free+download+for+androidPDF 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_off0000b754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB754 15008 bytes
SHA-256: 49202c817758f7cc66004f9bd798b235e3be98e4b7d32c1bb54f33ddd0b1f235
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10580 bytes
SHA-256: 49d5f8cf5b4745153c78dc4bd90e09aba48beb974db463de920fc64a11d23d6b