Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d3bb3ccdf404e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 06:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebaede1ed5e08fb21bd10a75ebd74787 SHA-1: d1f8cc6c6ede33969de1215cbd66554aca9d3feb SHA-256: 924d3bb3ccdf404e2523b0e957e767d74b803829e3a3a2ee9ef670ae4c4e63cc
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one identified as a link farm on disposable hosting, suggests the document is designed to redirect users to potentially harmful websites. The primary attack pattern involves leveraging these URIs for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1a5c8f0b.pdf In PDF document text
    • https://ximangcampha.vn/upload/files/71620517845.pdfIn PDF document text
    • http://air-con.ru/upload/files/pavakunapovelen.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/62467776069.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/75370768551.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911110622452737immji8.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/powazegilewamufezanuxaw.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/suvomofudebixazujemusimi.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/gojuluvefajezag.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/96490127710.pdfIn PDF document text
    • http://e-hematologica.com/users/file/dutezowekejomotu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9cefd7cce8e6b8f16ea2d06d66d4cd1e/94194031061.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/zevixiwa.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/95563795608.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/noxosofedatujirekadeveve.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/97997458980.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/86097532423.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210920_093404.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/finabisigesidin.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/25079392014.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/52696394195.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/burisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+minecraft+apk+freePDF 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_off0000c13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13E 17268 bytes
SHA-256: 23bed4aa50a536b6686b8d51aa762b873471f034b4143dbbd14bb2ed7d1ef226
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 10784 bytes
SHA-256: 27b638025d6ee4b6b3f1a020be899ae51ab4bb7499a873e53b324b463153f640

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