Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4033400466c805…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 01:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28be28390e21dd9d62f0a8c6d6631da1 SHA-1: 286998f65c189b05e0c851f97317b6cf4300b976 SHA-256: af4033400466c805b7699f4047be1f78a4683c53e12859868613e2356054d1a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with one heuristic identifying it as a 'disposable link farm on disposable hosting'. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studiotecnicoligioni.com/userfiles/files/tuvesufe.pdf In PDF document text
    • https://mashtalkandil.com/userfiles/file/62243000864.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/jijuwuxuxod.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/laxevub.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/74851000935.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/99906117307.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/56851771199.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/25408472590.pdfIn PDF document text
    • https://dom-titan.rs/files/dasobopolazoduwara.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614417b5bbb55---48353435229.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/relazopiwakujanite.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/bilulodawuxurubago.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/borezatasakolowukirefaso.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/47077015131.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/dunafot.pdfIn PDF document text
    • http://abnicum.ru/files/file/95692969518.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d615a8de44---52952947892.pdfIn PDF document text
    • http://test-immo.com/file/90276103850.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/71400022887.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109110038329069.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/3474361729.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/wewawoxovudimazatox.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/muxuvusoxowuxunuk.pdfIn PDF document text
    • https://cncunse.com/d/files/xafifo.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210901140008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+yugioh+pro+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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 19676 bytes
SHA-256: d6dd301ff22bd49c893314c40044a34f46c22be621d08f7a6d4a56f481c777f4
font_01_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 10576 bytes
SHA-256: 01ff043f9816d13b2f3a540c212f5d0d296bb9a2bf08dcb329f0fec4a4fa5ebf
font_02_sfnt_off000129bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1