Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5bba20180d5650…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 21:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17755a38f0f0b76a7d3d6ddc1030535f SHA-1: 6918bb31136e0f9b5c7dee086554ecf367929c7b SHA-256: ea5bba20180d56502d51070d2e8eea3292444e0a2eb2f7238c607eaf05efd6ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cpsguffanti.it/uploads/file/12775918017.pdf In PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/54333358585.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/vupokun.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/21732929146.pdfIn PDF document text
    • http://beijingteye.com/upload/files/pijojilurop.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/volaselinabukedotib.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/pubugumobamoluporetopim.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/99914314268.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/50633358238.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zupudeb.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/jejazenaxigedafilonivix.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/wunusak.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/83404643826.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/pipitinegugat.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613896dfb09c5---foluxenitimolunixabu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/95624309399.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/39585489085.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/59635477294.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/08970bef4d5463ce819c603a09913df4/75094421327.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210906171518.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/kotivo.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/77414390573.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/87498427276.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/871068681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+emoji+on+android+phonePDF 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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 10832 bytes
SHA-256: 077da5a8693396dae7ef8e648bba23810adb439ab6d59e949af1104b18fb624b
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 17620 bytes
SHA-256: c0e69ade405a115a03b60bfae4d06303dc6fc1176d8e6402549b7a1ed8ec2bd3