Malicious PDF — malware analysis report

Static analysis result for SHA-256 248720b3ff52a085…

MALICIOUS

PDF

67.8 KB Created: 2021-09-15 17:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 067f9f80755c307da854cc62a299fff2 SHA-1: 3b6272049bb30b8bd5fb80682f4f4033face46fa SHA-256: 248720b3ff52a085c495d75f9f273c2109af1092b66aee8e5b3f5ea734f771c5
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it attempts to redirect users to potentially harmful websites for phishing or further payload delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://philabc.ru/uplcv?utm_term=obs+download+android PDF link annotation
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/9644336792.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/9411439731.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/25319154740.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/10680468487.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/vafuvizutozagokasinebu.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/7098109743.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31627543745.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/buwiwufogotagixaz.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/62003480279.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/24484501066.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/xapiwesaze.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/59474648198.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/40933657741.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411c2ae7acf---pesimupugoxebejaximusiwu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b628e139f9---43982373376.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/wivonupobu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/konetipuperofirorif.pdfIn PDF document text
    • https://tch.lu/files/files/tiziwodi.pdfIn PDF document text
    • http://tradotel-riviera.com/file/86071494754.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17241475861.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/familujetotosidufunef.pdfIn PDF document text
    • https://12shio3.com/contents/files/budiwanesawevinenitu.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/bujituwik.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_off0000ae81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 14504 bytes
SHA-256: 1c312a30dd13758d7a15916bad47fbe933605675bbb818c73dfcc2c33d95af7c
font_01_sfnt_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 10260 bytes
SHA-256: fadd97b3286ea74f34a029ff7f1edd3fafc28c3bd2ad6c0a2a0d9dbd96ffcd05
font_02_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1