Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92de23dbb10824e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 20:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5cc9e82865915397d584863d1281b88 SHA-1: 0a51a15d00a82fc168eeeb00f1ce19532c4d11b8 SHA-256: a92de23dbb10824eaff03d20752012f8f0f8068d65ccec7412aad87337b24e15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=cool+math+unblocked+66 PDF link annotation
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/47797810125.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/44902619119.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/zakezanopapikazemagoz.pdfIn PDF document text
    • https://digireg.li/upload/25695492116.pdfIn PDF document text
    • http://net-marketing.hu/images/files/pebem.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tboj6d9j8smg5j4vt6ipr421ce/37553495218.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/firusomeki.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/59541251537.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/dufujulegateborumevo.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/2770986525.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210914_86775F7C84079730.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/96023281365.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/rosunolebezunowiwideriga.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6ed7aefb---64055571480.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/veboxowageke.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/18771256849.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210907054714.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/60399502434.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/98260452811.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/fusasavu.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/72044925482.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/95053486823.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_off0000b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AE 10804 bytes
SHA-256: 4b85e5d07458f5f01c44ef4596c45cb158bd0d514efe868547cbaf32718a5b2c
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 17040 bytes
SHA-256: 4c83a9eeeb30f6381ebf603581b7183b2a524cb96f98600f1a6fbb8c27d42560
font_02_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.