Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4ad3dd98c2f7af…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 17:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 634f1feef8b705a0deb21dda389febc8 SHA-1: 2d7fa0e4c9335e1c93c2315be2f5efe2f81fa71e SHA-256: fd4ad3dd98c2f7af97e776eb719b4720f6dd22ccef56ffed92372741a69f3d31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. One of the embedded URLs, http://2222.netsociality.com/upload/files/tilolivixezeru.pdf, is a key indicator of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://2222.netsociality.com/upload/files/tilolivixezeru.pdf In PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/62626803514.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/34042148979.pdfIn PDF document text
    • http://e-menu.hu/editor_up/23866138966.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614090b62bed7---rafowerogakelada.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/11438483585.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/musipevavezawaz.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/81710012942.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/kituraxegenoneta.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/77089768746.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/64508277726.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/48892789812.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/10940394361.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/42958592758.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/kosadalo.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/44211736687.pdfIn PDF document text
    • http://belean.pl/userfiles/file/22708768553.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/kupuz.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/lejufazuxawaxarofigedasiw.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/kowinimijizawubifazarin.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/wixowit.pdfIn PDF document text
    • http://teresachild.com/upload/files/7618317449.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/luvuwi.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/pezuruko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=6+letter+word+that+starts+with+vPDF 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_off0000ae12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 14344 bytes
SHA-256: b2ca571bff473c1bafb4753f1695bab35f4a5fe0b577280e349285cceebb4d67
font_01_sfnt_off0000d205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD205 10464 bytes
SHA-256: c629f8d851d70b992c2a33f5f41394b8eed1bda5b290d452d745da3eddea7251
font_02_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1