Malicious PDF — malware analysis report

Static analysis result for SHA-256 f340ffb477c5c3b9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 19:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e9eb976d7936a955dfaad4ce39e4eeb SHA-1: 79986541e3369eea4219f68198055bdca54872aa SHA-256: f340ffb477c5c3b9d0c0cfa1cc8cf81cb43116fe61b65bb4e2617dcc166b372b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with a high concentration of links on disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of leading users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ngocphuocjsc.com/public/default/ckeditor/files/33715453425.pdf In PDF document text
    • http://amsuatrust.org/survey/userfiles/files/tinizagapexuja.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210910_081215.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/minag.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/11803103720.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/birikasavobuzopujotiperuz.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/mijorunekitogegixotononul.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/31573590288.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/pulamekeduzok.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/gedegivokakazipolenava.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/58388565988.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/38374429143.pdfIn PDF document text
    • http://irinabailey.com/upload/files/ximesapuwupijeromixowoge.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73931371632.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631474329.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/govusomizuvasiruk.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/19741571379.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/rinokizi.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/27911346333.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/89351427523.pdfIn PDF document text
    • https://network-italia.it/file/fefalivexibafoporuzaruv.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/21389978538.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/noxulovunofirukupesi.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/8918558b701b570c79c17c30552543aa.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/12005005559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+san+andreas+phone+mod+androidPDF 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_off0000babd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 16960 bytes
SHA-256: 97b63760f3703858274bb5534b53a184931cdb74a08b77866194ccb71f3103f5
font_02_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 10648 bytes
SHA-256: 03966748bbe7e767f4f6ffa8a3f02a4eb60bf791502ca841b310ddb3fa2f2933

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