Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea15e0c97d78a2c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 00:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea85a49106f3045764964f3ac3f6edd7 SHA-1: 428274a8595647424f886bf66d24bbb6f9bdba43 SHA-256: 9ea15e0c97d78a2c545eee35c83ff2dc116b4e454efddddcaddc32cda6ecd454
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggesting these are part of a link farm designed to manipulate search engine results or distribute further content. The presence of multiple unknown URLs supports this finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://onroerendgoedindex.nl/images/uploads/63062352673.pdf In PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/50381566235.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xovujozapem.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/60105070863.pdfIn PDF document text
    • https://ptogel1.com/contents/files/busorujudo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/14838563052.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/73154511212.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/kilemezevabez.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/10215401569.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/28010156281.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/labowujuxinazimiwugadunu.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/81946743314.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/16371127600.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/15074884942.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/dutolununenamani.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/1488356267.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/bilewijeripomesizuluba.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/nadiveropiwutikak.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/wadopenusejadidafefubi.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/32497496147.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/tugopoki.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e4fb41ae5---suzusazox.pdfIn PDF document text
    • http://inwestorfinanse.pl/userfiles/file/65106731826.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109070605028380.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/budotojimod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=drawing+cartoons+2+mod+apkPDF 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_off0000af4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 10980 bytes
SHA-256: 46917f2a6ec4dba8d3a1c45f31b1ded1b19ea9d820366e72579ad8d0d156f8fb
font_02_sfnt_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 15544 bytes
SHA-256: 17e8a116bed06ec8a83c280cd57cddf700aa74b9b33c46d333a3048bbfe28ca3