Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7bcab3211a83ed…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 13:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1d9f0e489ebe8c1d010859c6b843f133 SHA-1: bef9e4190a127be12d49a8b84c758810ed7d3845 SHA-256: eb7bcab3211a83ed0ea3476a221c450a4d93cf6ce3930839117c1cde007fdad6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=virtual+dj+apk+full+free+download PDF link annotation
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rp4tan8i7rh395fu0mct0i427g/79733252878.pdfIn PDF document text
    • http://kvrhousing.com/uploads/92423392730.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/derikejanagojeli.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/fojitoxesevaselusokitakur.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/madosipemiregev.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/bewerasoveguv.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/fivewolef.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091022273052.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2595c466---30782989740.pdfIn PDF document text
    • https://olajpark.hu/files/files/48997485869.pdfIn PDF document text
    • http://topflexsports.com/uploads/lerejolupe.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/mumadowudalefiwiw.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/zokuvenevag.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/zibegebumifus.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/8290667453.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/19067015059.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/bokuburigopi.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/35404612042.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/80065204264.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/41299843352.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/mifalusut.pdfIn PDF document text
    • https://ccskin.com/geektic/files/41026957560.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/81417356478.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/pekamavidelakibid.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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 19428 bytes
SHA-256: a01d3b4a69c843a7384f4363f20572560d33f7fdfd01d3980f0536c61837eda0
font_02_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 10700 bytes
SHA-256: 8adbef7cd0832582594d30b2e0788483023a953f60779c34c40b092f4977ea05