Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f90b4f523c6166…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 01:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f737ab8151c54ccf7f14eb40a866a6e SHA-1: 9b94b96c7cb7e6e77231190e6e1d53071da63320 SHA-256: c9f90b4f523c6166211a638d65b7acb74748a9ef422e5232929cca655bdbe5b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. It also features numerous external URIs, many pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://felicitareonline.ro/ckfinder/userfiles/files/vexubirop.pdf In PDF document text
    • https://thefertilizergranulator.com/d/files/19027724480.pdfIn PDF document text
    • http://taigesw.com/upload/files/86976373285.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///59721514593.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/derujuneminupatikusex.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/48417632236.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/jeluxikizuxowafawanaz.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/90955289497.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/21049150222.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/nulidofi.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/25936230098.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/lalewawujul.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/30017744146.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/6058843040.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/43434713121.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/7693690166.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/xikipi.pdfIn PDF document text
    • https://edusfera.pl/upload/file/40925662793.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/31733621291.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/60325612562.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jeloxowefo.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/lireg.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/69359729969.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/donavebikunexonunijiw.pdfIn PDF document text
    • http://hoachattn.com/image/files/14892248936.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/37223961281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+android+phone+vibratePDF 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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 20176 bytes
SHA-256: 747b40bd369a136a7dbd66ba6b16ac67c4bfbed27edb52eef40696c2f0d413bf
font_01_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 10820 bytes
SHA-256: 221c3f8d8364d58fdec8ba9463ea253f0121c0c60e3594833ac3d12102d819ff
font_02_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1