Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6b4c59e6efb3db…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 07:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8e39d6e9fcc226bdd48a55f151e86c4 SHA-1: f50b38aaa75d6d0e2a2d193ffd06ecbd964b17fe SHA-256: ec6b4c59e6efb3dbc07e82028b6fb6f837b6a356a0c111d2ea4f8c6fa053cc5d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f3b92fbb---wutarixijujutozefomus.pdf In PDF document text
    • http://islenapuntos.com/campannas/file/83563995689.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/24693425899.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323bd151264---53319647506.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/28239758998.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161378532a54eb---48184210246.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/3859547533.pdfIn PDF document text
    • https://slotpt2.com/contents/files/2457132379.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/21162865987.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xonalesufuluxud.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/7528368222.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/34630883786.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/javava.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/gabupepubogamuduzepi.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/forodutelugiju.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/wotutunutigogubeg.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/52661697183.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/83477145327.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/1122013931.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/98331070364.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/50072858457.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/muxuxevi.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/33371577528.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/lupuzusojiputinogi.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/winigotutufovedijesa.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/sizipekunexogelodumuzove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+unlock+redmi+note+6+pro+without+passwordPDF 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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 18556 bytes
SHA-256: ca4bb3f4f26580305dbacaab4353f1c5ee4711c5fd31426e20710d70eefa4de3
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 11216 bytes
SHA-256: fc4a7117ac843be63c15d9fa538cf755100102e5d9351afbcd1bc4f53b7d5a6c
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1