Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f507329f0f7f7ac…

MALICIOUS

PDF

79.9 KB Created: 2021-11-12 01:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 186be54bd0f91af4c364120349104c9d SHA-1: e56a0ff58b279598d1cbd04dcc987ee8c930f570 SHA-256: 9f507329f0f7f7acd7fb0890134a3113e51b3b7fba7f5c65466ba5cff6c5b93b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://mepho.hu/ckfinder/userfiles/files/baramozekomenugatoxafilu.pdf In PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/lewalobo.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/sakikagasu.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/dozijuloluwizexapaba.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/gitegamivoruvi.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/guverunaja.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/kabagavonikalenuvegasew.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/muzunoduzozisobuni.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/vepetarabuni.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/wopojusiravesin.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/28174101013.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1618afb9178a8f---75610722976.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/3120993413.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109241647193126.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/tokizagazadejikeme.pdfIn PDF document text
    • http://charontrade.hu/data/file/pevatu.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/samekemakexunifaxak.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/nisatumi.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/buxufimovawudavejisofo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/957056858616399586e15a.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/jajusemugixorodaxodilog.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/tisofawojoxedimakodofuru.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/66411550372.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/pumewag.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=how+to+make+melts+from+old+candlesPDF 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_off0000ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 21248 bytes
SHA-256: 7fe76d2a8224b24c434d51236fc03942a764058385e406334a6358160efca493
font_01_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 10712 bytes
SHA-256: 0198217ef6c1e5ddbed7224da49682e4564a5df12a22b4969f3bb10bf86f01d4
font_02_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef