Malicious PDF — malware analysis report

Static analysis result for SHA-256 6191aaf0f62907fe…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 08:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 638e0fc556bec0462c6c06b982e0c58b SHA-1: 416895cebaa973e535a8240751d381d6db68fafd SHA-256: 6191aaf0f62907fe1e039fef1fedc1f4275872977ab240815b08084a6c39a047
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript stream further supports the malicious classification, likely used to redirect users to malicious sites or execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=dog+walking+groups+near+me PDF link annotation
    • https://coonvalleycc.com/userfiles/file/45378907.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/powigezabuxad.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb4a9b85f---jefafalutanutuz.pdfIn PDF document text
    • http://szm.hu/userfiles/file/ralebojabozomemev.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/35384447315.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/42086476390.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vusobar.pdfIn PDF document text
    • http://splogservice.ru/content/file/nijenoxepi.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/momemevag.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/59014983613.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/24356145193.pdfIn PDF document text
    • http://full814.com/upload/files/33459898431.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/58839216673.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/bokujew.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/57854349936.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/mufesewogasaropufad.pdfIn PDF document text
    • https://robodom.si/files_vsebine/77007700865.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jolenesolivido.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7a9c4f56ce91ca1caf79127a870dedeb/7053319713.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/buvupumebigukonad.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/53889555705.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 17880 bytes
SHA-256: 6c000cfbb90c290b80f2c8a37e49711253787de99b24bb1f02f313a81d6635fd
font_02_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 10776 bytes
SHA-256: 239381b9f4c450af6af3e6d6f251484edc30d34610281ad87a8839f477e805f3

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