Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18b9760b95ffedc…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 04:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f53ef8e8d672ea5f303aa688d0df714c SHA-1: 569f1067e871570a4b45f6ace1308f2234f8b5dd SHA-256: a18b9760b95ffedc6b66e1bc13a52a36d6b162478fd6104f4f6c8713a49ced62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, pointing towards a phishing or spam campaign. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sanvexe.vn/webroot/img/files/dirojif.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/files/39664364411.pdfIn PDF document text
    • https://titishop.co/upload/files/85738807626.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/ae18fc95b7157fdb4440d7a73c1412ee.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/43210951656.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/11029857253.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/xutazizunis.pdfIn PDF document text
    • http://kd-council.com/upfile/files/9253532508.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/zizowumekogivupuneveko.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130970b521cf---nututa.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/rixat.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210921080645.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109112311254857.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/88065181844.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/34721462029.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/gobividigununonazoji.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/46149302309.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/jonis.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/loneraluz.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/10637052509.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/rasumazadenifanimiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=happy+gilmore+putlockerPDF 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_off0000aaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAEA 10740 bytes
SHA-256: 5831602e61db4e87c8d9f8e298b5341874eedc5a77c45a4bc12521eacae2b6ce
font_01_sfnt_off0000c3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 14496 bytes
SHA-256: 05532155d0d748fa8f87d44a7750647f519d5c126823998aec2aa18d7ff7b243

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