Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5a3285adc8c186…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 19:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6aa84f1f3e97210f0e0fb830b3a64c5a SHA-1: 4fd625b22ea2954d9737f3cbef91f40a4d8ae9cf SHA-256: ee5a3285adc8c186b874a1a693045e77ba1fc049887d1330577c0ab580987eef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the presence of numerous embedded URLs points towards an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=i+have+done+meaning PDF link annotation
    • https://thailonghoang.vn/upload/files/20206047017.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/voratenidudew.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/10509694092.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/lumedidaz.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/56875626236.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/75290397992.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/buxizugo.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/75448997427.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/rumaribekum.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/1905601015.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/83999141525.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/5294116713.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/kojuseno.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210916165855.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/lexipubarix.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13457370210.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zafenaserug.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/2008256037.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091813420093.pdfIn PDF document text
    • http://www.heksan.com.pl/file/66771267190.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/46461530699.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109121737502491.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc6619f0c---duximawimogukoguxox.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/wugedisonusijetuxobasa.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/vuguxepewisov.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/borurasiduxegokejib.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_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 17336 bytes
SHA-256: af53373ad5185ed153a7eed33b00db6f790f1fc5ab331f0cd32797cec3e5173f
font_01_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 10300 bytes
SHA-256: 4d9551262e4a4498c3996dd03424954796b5542076cd0fa55decba07ea69f391