Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d53aa106ea5c98…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 05:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22ac9def595893dcd41edb62676151d5 SHA-1: 9e9180616fdcd8cf4e0fb6df35b16f688220cb36 SHA-256: 47d53aa106ea5c988453e2bebcd3eef7a8a41f3fa709c2697dba38e6ec20d48b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating malicious intent. Static analysis revealed it functions as a link farm with numerous external URIs pointing to disposable hosting, a common tactic for phishing or malware distribution. The PDF's structure and the presence of many unknown reputation URLs strongly suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 4

  • 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
  • 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://synerhu.ru/uplcv?utm_term=nct+top+and+tail PDF link annotation
    • http://gyndoktors.de/ckfinder/userfiles/files/sizedilu.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/5366577226.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/63457653310.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/0die5mi1gkaqnito8umbb4n5m8/sugedoz.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16313111522826.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/fegunazuruxuxomeme.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jozewivorokosuzinikezu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/73549954946.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/17948187633.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6324bb6f4---57805896532.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/gigifepesovudavenafugewow.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/4380089169.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/87895064180.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/jogoxavivewozaluzeluzajug.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/mebuxevuvesaguzamesasidaz.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/gebatetojunanowi.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/befakalilofusitesux.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/95633117999.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210914_10E8AF4DFBB557C7.pdfIn PDF document text
    • https://unaizahic.com/Files/files/82201265037.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/56681130455.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/mujafibekafewamufo.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/61693901148.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/90124111818.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10084 bytes
SHA-256: b3640660afe3b13b87668fcd7843b89aaf1d3e501ee719f8f5e5d95061c0aed2