Malicious PDF — malware analysis report

Static analysis result for SHA-256 a223f93eec61ed40…

MALICIOUS

PDF

111.3 KB Created: 2021-09-17 12:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ad13e146b8968a280fd97ddb52f3574 SHA-1: 17decdc95d4f2b6d0199a7ca887883dbb17cbcb6 SHA-256: a223f93eec61ed40b2e6e6794ba1f165b661223f744781a7f5a1fcd1fbbaf537
142 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable hosting, suggests the PDF is part of a phishing or scam campaign. The embedded JavaScript likely attempts to download and execute a second-stage payload, aligning with common malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://qiangka.com/ckfinder/userfiles/files/22751126644.pdf In PDF document text
    • http://axi-hohenstein.de/userfiles/file/wiwizibamemotepuxoten.pdfIn PDF document text
    • http://umhouses.com/uploads/files/wajevazubi.pdfIn PDF document text
    • http://esejsc.com/upload/files/64773333973.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/zowugadazeruruzupitiz.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109041704068685.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133363e07944---60373399380.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/midadesesum.pdfIn PDF document text
    • http://ossokahve.com/upload/file/semejolezuxirugofuki.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/warowamew.pdfIn PDF document text
    • http://irollee.com/userfiles/file/rodiv.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/59271447858.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613510821cd63---tosozelegeganad.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/76621731873.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/puwafowu.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/pejexu.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xufanixo.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/22937475278.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/14505439981.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/tovefikonixopalozikinuw.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/17378267218.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/86006003643.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/49453235835.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/riginajonepixamepakegur.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/laredokisefikut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ruby+red+romPDF 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_off00014f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16726 10136 bytes
SHA-256: ecb83201e7b05df6f049c5d842718f4d65f08b1d0b5c2c6cf4d083e350ea1bbc
font_02_sfnt_off00017dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCC 19176 bytes
SHA-256: ab9ae2be628c28d9480b39e11386abbfde7f000d44aba30af512b8d9ff224aa8