Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e06b641bf07c803…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 01:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08a64c8df8ed63b7d1c2e083b9d21bc7 SHA-1: 0d719df2021727e6f2260bdd1e7312a0cf7d2dea SHA-256: 4e06b641bf07c803fd9a1cdcfda43b6182ed93e8f00372e42cc7ea18f5f0b1c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=app+not+installed+problem PDF link annotation
    • http://fsgzb.com/upfolder/e/files/20210925060350.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/popafemamizuzes.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/42483939408.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/40950684298.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/xijen.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/rigotitewedaxo.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/95833060022.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nelexem.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/36215130159.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/52359399867.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/78840402285.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/wadizutokevubod.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/93141468759.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/kusukobupid.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/38468017274.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/3185758706.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/tasunerenepevanenajatejo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc9bf2f2f---komozufekinevenefib.pdfIn PDF document text
    • http://355353.ru/userfiles/file/13876149609.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/63852936082.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/vefexitimerivufako.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e42ae852e5---fapuxafogej.pdfIn PDF document text
    • https://medtek.vn/storage/file/44167881234.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_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 17008 bytes
SHA-256: 3b8c4c74bc52e101472bb06f8754bfd86da6300f2819f924ee04de46b9b034f6
font_02_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 10676 bytes
SHA-256: 8150f72b21b6c0cfd144c79a31dec9e74ab4dae03247abd6e44f23bee748a1be

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