Malicious PDF — malware analysis report

Static analysis result for SHA-256 21877bb1ef5f0a29…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 12:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f251154f6aa0999004a1d306f728019 SHA-1: 7d03f4c2e07f60e03e5e8f0ce708b05f17256aab SHA-256: 21877bb1ef5f0a29789d9761b20fe9d905596c7fe0ef6a34e4958b87d073f4ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the phishing lure, likely to harvest credentials or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=introduction+to+health+care+management+pdf PDF link annotation
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/lisigajazexatav.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/xaliruxumepojilavagenilip.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132a2ffd2325---wusawivus.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/mobusoxifaga.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/keratonukiz.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/98994245330.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/66622611657.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/474943872.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/68806547654.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/xawepikivogixesefitinagi.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/nafovatipibixunab.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/kisadesalovudola.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/11845400306.pdfIn PDF document text
    • http://runo34.ru/attachments/file/56482183954.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/sazulomufunofeguperagun.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/rolonal.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/wukoxewo.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/bazupob.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/lejemukiparutudogevu.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/tukubetaxufogebim.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/54156940075.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/22574543276.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/81fe52a144f330aabe769789434d8edb/moxemazog.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/xijasigopag.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_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 17808 bytes
SHA-256: 5c0d82aa7a829e33ba073f3fa424c717ae700ac5980df8488488e9004bc4165c
font_02_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 10948 bytes
SHA-256: db02866b1f298aec8bb7de2f91c9069689d173be6ad293704d5204151fd9e736

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