Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f48dd572236737c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 11:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 379cdc8a9117cd6886f666f75e801c62 SHA-1: 41b30af404ca23aa67574664b7204ede61fca8fe SHA-256: 7f48dd572236737c2f1af302a8be35edb9651c5b8ca81e580646e6533a8b88c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs pointing to disposable domains, indicative of a phishing or scam campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=publishing+an+app+on+play+store PDF link annotation
    • http://joyerialaplaza.com/ckfinder/userfiles/files/93896916145.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/87952681679.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/67808230639.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/mudup.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/39271767223.pdfIn PDF document text
    • http://wjcopy.com/upload/files/16706630890.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/96151759788.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/436843331.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161315eaf15de0---badomiramu.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/nusanojitedaxijametekapog.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/93337108560.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/lovaziramakefud.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/67228390079.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pavenikasatitatidixixogev.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/12508335628.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/76472978828.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/zexesa.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109130208273002.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/safuvadifad.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/69052727492.pdfIn PDF document text
    • http://henca.com/files/details/file/9549642169.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/solis.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/45436840880.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_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 18320 bytes
SHA-256: 5d0d482d7d5cd93aa1c6dfe323ac0e62cdf4dcd7f59d7d818a3e88b989110a14
font_01_sfnt_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 10888 bytes
SHA-256: f9ca730bd731ff476ffded1ef078f84ba0ef15ca94a4b81e6ed5b2501831caa2

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