Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc7a31cf808ab88…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 05:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b29b0287194f62752a910e099f25417b SHA-1: 3cd2307b9fca761a462bed97ad938f70e4a01f44 SHA-256: 9dc7a31cf808ab888791dba67eecc247e4fda4711d554d424254bbad6c2dddcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded external URIs, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery mechanism, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=magic+tiles+1+download PDF link annotation
    • http://ekhoron21.mn/uploads/files/21405814234.pdfIn PDF document text
    • http://kunbot.com/upload/files/39757285159.pdfIn PDF document text
    • http://dhf-china.com/d/files/96045290925.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/23606283152.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/13717620273.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/rusapovewasuxogufi.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/tojoketudozegafipesatitav.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/51323459698.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/72536222878.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/bipumomutupuzubon.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/75255379210.pdfIn PDF document text
    • https://deepex.hu/hirek/files/84653045426.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/93759648306.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613727ee3f4de---mijedugidabev.pdfIn PDF document text
    • http://zamgph.com/uploads/file/032201309021.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191367518264.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/62364761742.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/96484644240.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wodakinitakuw.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/didepoluwevazefokugi.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/53664091858.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/56933824439.pdfIn PDF document text
    • http://handgun.ee/media/file/zifojonolipupa.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/59356834698.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/lafolozenu.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_off0000bf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 10576 bytes
SHA-256: b9297bbd45a91218da23085291caf6b4acc2145cd65c7443fc9da9555907d81a
font_02_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 16336 bytes
SHA-256: 8d6d6db1908ffeecb8e74807acffe47c27e83f55651a7b0766eaa6fdd30f8429