Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7163600c52feb81…

MALICIOUS

PDF

70.4 KB Created: 2021-09-12 06:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 373050f8807e7b6baecb3eb740137e6c SHA-1: c8bc66141d69b2c5fba1307a47dfffec45533089 SHA-256: d7163600c52feb81b9cce25826346347a254178e61f0aecc911f305cd17e62ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with a lure designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crewmak.ru/uplcv?utm_term=framed+ink+pdf PDF link annotation
    • http://land89.com/ckupload/files/4580572270.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/91596334495.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/97434193960.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/xufuwos.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/jinatewekasodutupizopumak.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/16907441077.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/9579182146.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/jebagiwakuwepadipu.pdfIn PDF document text
    • https://hiroyoung.com/data/files/291447088.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/143764735.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/11162563919.pdfIn PDF document text
    • https://5uempat.com/contents/files/49400637753.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/40952644886.pdfIn PDF document text
    • https://camphacement.vn/upload/files/11781793210.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/bixezolekasewojenuzibefu.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/rosololivuxiweso.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137665fb3cfa---73701044826.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/48594907878.pdfIn PDF document text
    • https://profm.hu/files/file/15474994590.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/73225215049.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/44889531544.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31538284700.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35ab0b8781bc93596d804f58398b87d7/gilupa.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/juziwiwevazibuzawika.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/83735934201.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/paruremikij.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_off0000b0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C8 10296 bytes
SHA-256: c29ac7985194f27eeb455c5ebbdacb8ce5eb98346ffbd5b6f26923623ae27b90
font_01_sfnt_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 16980 bytes
SHA-256: 4db7c5476e87fbf4720c7033daee62540cba5c95b0624f66792bf8517c7363cb
font_02_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1