Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d627813ea1e43c6…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 04:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08a543391b2878c11ff2801015bff189 SHA-1: ca872c014461a7d3a0f522d5fdb3cbbad59ba454 SHA-256: 4d627813ea1e43c699ca033340a6f98ba609f8298be9444bc0295ca00e029b9d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=can+a+composite+number+be+odd PDF link annotation
    • http://elvirajogsi.hu/ckfinder/userfiles/files/23509199075.pdfIn PDF document text
    • http://17njl.com/userfiles/files/jetufukuxa.pdfIn PDF document text
    • https://alev.az/userfiles/file/dapajalazadabud.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/21890080640.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/67382878213.pdfIn PDF document text
    • http://happy-land.hu/editor_up/90430002403.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210913045251.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/93436952147.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/83777578611.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161316fca65ffa---finaxu.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/bitolanutatalaja.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/77637665824.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/90781399792.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/zixexaxowafo.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/31142333171.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fagusivujopabosis.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/90106130391.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/99778863534.pdfIn PDF document text
    • http://okun.su/upload/file/29234615317.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/kinunibaseji.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/250884030.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142afc71b244---25074521277.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_off0000bcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF1 10900 bytes
SHA-256: 1a3d8582a93a5aa520dab500452674d4e0b021365889f976feb732e0b7308edc
font_01_sfnt_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16916 bytes
SHA-256: 0b17e10d28ac37741ce69cd9809a564ac267ad3bb4186342dbb5ddd68bd226a6
font_02_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.