Malicious PDF — malware analysis report

Static analysis result for SHA-256 2808bcfbfe7cef47…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 14:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ecf4b11e4de5446348a05348ac2520c5 SHA-1: 5714dd160af1170f65df4f8039389979036ef240 SHA-256: 2808bcfbfe7cef47f224d12093a15496a73c455c48a122cf06430d15fd978288
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicating a high number of distinct hosts and a link farm structure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the redirection through the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/6675906039.pdf In PDF document text
    • http://www.ap-arte.ro/fckupload/file/lululu.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/dexod.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/76779978671.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/givit.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/51108078379.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/neminej.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/73748324913.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/10110399356.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/devimevugamafukaziwog.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/nuwonipugixuvokoduma.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/rotudodo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/72394589141.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161370e70ed43e---lokuwun.pdfIn PDF document text
    • http://altus.pl/userfiles/file/39048937589.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/7949441814.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/wuwavizebobi.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/zirobuniwuwuxujen.pdfIn PDF document text
    • http://vina2002.com/uploads/files/14483048617.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5ee4d775---53605674794.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/14346840424.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/68248625693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lightroom+6.0+modPDF 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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 16672 bytes
SHA-256: f41b12d57d4ee33e3bf62d083d53ea987fe6741291a114db2ede5784ea5be43e
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10396 bytes
SHA-256: 782b52ab57c39010a403c4a351ec54c826b6c42164b2a72d9f4d2066471065b9
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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