Malicious PDF — malware analysis report

Static analysis result for SHA-256 9869b77c26454790…

MALICIOUS

PDF

79.1 KB Created: 2021-09-24 22:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f5b2aab1887465df900e96ad91f9de3 SHA-1: 58bdc775414a541823da822a5689dd4f0c799575 SHA-256: 9869b77c26454790e7511f35c82f69bbd791d7c1bda39d3b1efa24e7e17faaef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document functions as a link farm, directing users to potentially malicious or phishing sites. The document body was unreadable, but the structure and URL patterns strongly indicate a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • 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 http://clair-environnement.eu/catalogue_dynamique/file/negidadopo.pdf In PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/7310268371.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/43925320433.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/lijukenabeminoj.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/24940628791.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/932972e12c37c0dd503c4b7e0768688e/65208208779.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/dolufalunami.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/66688288721.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/lefipotemu.pdfIn PDF document text
    • https://ienter.bg/files/60869734164.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/27667786603.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/lamabukagukoparev.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/selivukefakafeb.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/47539344323.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/nowewezomukiwosus.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/71778426099.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/medesavuvomuri.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/zisepesas.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/567a893d7fb5ed6583c2dde3244e374b/xawazilekuzaxawafunuwufi.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bivujumoreko.pdfIn PDF document text
    • http://fullx.net/files/89329359495.pdfIn PDF document text
    • https://verner.lt/images/files/61026723492.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/movatikuxapafivow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gastos+de+operacion+pdfPDF 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_off0000bda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 10604 bytes
SHA-256: 4414bf19d154b13c54b28c5508edcd87ea60cf53fcc6d04cdb3433646deca4e6
font_02_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 25300 bytes
SHA-256: 87c8f1faf2d60443bb116237f9a9ebedca0b5f96526511f2952dc59841db2abe