Malicious PDF — malware analysis report

Static analysis result for SHA-256 f381bc264dd4825b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-22 23:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51c44636c1720be06cfeb907bd25c539 SHA-1: 16450ee257d38054b3c0c95572c4c0917ed89168 SHA-256: f381bc264dd4825b6d9d3b59613b37dee927f9c2ee4784e51e9bf3009bfef283
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to potentially harmful content or facilitate further distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • 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://dcimx.com/files/91516091605.pdf In PDF document text
    • http://dytac.hk/userfiles/95183945540.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346abb13b7b---bakikizulelap.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/52107645098.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/7315618064.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dovuju.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/29550591501.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140a862aae68---verunomakepof.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/73713270528.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/rebobur.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/pokenur.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/72369382914.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/kosulazan.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/23242671635.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/5127024819.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/nadoxepudigodajipujibar.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/viviwezogusazejenubafelo.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/52541103661.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/pefigebajebalenamifef.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/gowizege.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/wamiwemejijekegedamuri.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/38432390568.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/kipudogunanigojaniwonam.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/6499749900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=get+free+instagram+real+auto+followers+by+malik+vasid+ig+bestPDF 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_off0000b068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 15940 bytes
SHA-256: cd146a678cec8eb08f58b0b2bd609dd449c298b8594c89c158a9b785320a4542
font_01_sfnt_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 11336 bytes
SHA-256: bc0632baceb150935f405313569971701d241c0e1b03afe2a79f80de7200abc5