Malicious PDF — malware analysis report

Static analysis result for SHA-256 3469e6da1cd97485…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 01:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7718658a2131aabfaf59c8ec1b9af84 SHA-1: 640a21cae22edb52f5a6238fa425b499d36fd754 SHA-256: 3469e6da1cd97485c003e206aacb4328d0348256400254cc11143c089bb9fea9
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The presence of a link farm heuristic further supports the attack pattern of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://3sdent.com/upload/files/kejekijin.pdf In PDF document text
    • http://homestationrealty.com/userfiles/files/34563340775.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/62795724558.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/didofewezagetowupezoz.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/tuwovenuwesazejavufurufok.pdfIn PDF document text
    • http://orenprom.com/img/account/file/57603244428.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/jowagewetejate.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/tenirovulixaxabuninegowal.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/36360359732.pdfIn PDF document text
    • http://kisito.com/userfiles/file/donekijojefewajutefoko.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/vulewebasaxatideruxu.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/nolafewazatedibot.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/nawubi.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/27780468490.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/laves.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/65710469268.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/namuridan.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/remufibadunop.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/92525367591.pdfIn PDF document text
    • http://exosushi.com/uploads/files/17797046455.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/nolobuvinawifid.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/4141144030.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/sedetawojadelanopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vpn+premium+apk+2020PDF 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_off0000adb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB4 10384 bytes
SHA-256: d1b9a01d79e9aed938de4a988b182632f4b71424b051d4563ae6aef90c03f2b0
font_01_sfnt_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 15884 bytes
SHA-256: 8fda42664a18d17a35c3447f4e56c7cb8d6bc468e85070ca5ab2e604aff1dd01

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