Malicious PDF — malware analysis report

Static analysis result for SHA-256 287670101db6181a…

MALICIOUS

PDF

96.7 KB Created: 2021-09-13 00:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a1a7564602f9e549e1afa6be5447a10 SHA-1: fdb683e757340bfc4fc44cbe14b5d12a47ea35d9 SHA-256: 287670101db6181ab46c9f3fa0c8ad1fbd46f651e8d09c73fd7772af12734bab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically pointing to a 'fifty shades novel download' lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://drafthe.ru/uplcv?utm_term=fifty+shades+novel+download PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161327d394cf18---jinozoxamibulisuronub.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/4095022360.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/sadaxusivabaka.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/tidilorimenokojanadusir.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/35557457012.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021910_9229_766.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/45017559950.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/57966736262.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/11685249651.pdfIn PDF document text
    • http://parfumland.sk/upl/91015096224.pdfIn PDF document text
    • http://innotack.com/userfiles/file/kigekejoli.pdfIn PDF document text
    • http://glassick.com/userfiles/file/jaditiru.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/80288277239.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/29283238746.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/30296861683.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/80344794513.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/kebepubitevijo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380ba406624---34455463600.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/3667097.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/52095991179.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/wevixafibevajiwujuduvodiz.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631369284546488389.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/munadefijixuwix.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zumejiwuwuv.pdfIn PDF document text
    • 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_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 10592 bytes
SHA-256: 5d243d34714f9bc22a2f630ecdc0816d2635bc67d1fdbca5a0e8e2a3902f4a94
font_01_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 19472 bytes
SHA-256: d91eb0206f97a009df13b49ec36186dcb7bd7588a69cbff31bfeae07a41acdd7
font_02_sfnt_off00015cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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