Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bc75f1062fbf29…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 02:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3f7779f6c27be56c850d9dfd857179c SHA-1: 8937b32c09a3ca3497e6b0667368a544cd9171b7 SHA-256: 23bc75f1062fbf29b5b24c00828619ec43f13f168d2aa28a633bd9c86dc5721f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=low+volume+bluetooth+android PDF link annotation
    • https://magiccat.pro/ckfinder/userfiles/files/sofoxuwewevenito.pdfIn PDF document text
    • https://nexusmediation.nl/files/63801594622.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/sofasite.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/38192296399.pdfIn PDF document text
    • http://infunplastic.com/d/files/luruvu.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/xipijafuwob.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/18141106295.pdfIn PDF document text
    • https://slide-bearing.com/d/files/83452790895.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/dubotogemoxug.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/bedexa.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/74335794305.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/92564371676.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa1cdaf478---dadumozonoxetiwowaxeri.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/33467499650.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ni19ei58amd89em5iiuk7mud6s/85147386444.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/jaxilikeponewizujug.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/11031947412.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/52536177964.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210917223006_1554910308.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/rixes.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/kagilezekopudiboga.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/roranolebipukegojin.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kanonejagas.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/zubafejovulopibori.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_off0000b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 10696 bytes
SHA-256: aa54ef7e61957249a182f726db5f0991d9dad6e2a60e16ce6858cca277895873
font_02_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 17320 bytes
SHA-256: 1135f48289ae149147e54f5db26ad04dcb01f8fc304dbab63e5b7d01947b5f2c

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