Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d49d3e838e067bd…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 00:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29f994f448092728c85186497a7421c9 SHA-1: 10333a695916c34ebc015aa9e719e2a8624b58e2 SHA-256: 3d49d3e838e067bdd49293a4c36330a9f5147284371883d24437def2189efcf0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's part of a link farm. The embedded URLs, particularly the one on 'as-eng.biz', are suspicious and likely lead to further malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to exploit users through a deceptive document, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://as-eng.biz/userfiles/file/mixalolepijunuginifuma.pdf In PDF document text
    • http://elsped.hu/files/file/tajixu.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/14209721946.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/lawuxadipo.pdfIn PDF document text
    • https://ottopianos.nl/files/20439054211.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/7661161743.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/23417485291.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100749367014.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/60454245587.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076df9f035---80599953097.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/54617141163.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/juluwagejobexosidij.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/67727540837.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/37183399703.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/35225714501.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/28626313131.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/41144999046.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/90402326127.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613584e7692a2---19726787060.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/8345395812.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/gurinuxizap.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/tifejakowituvex.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/zaxuvon.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/vilogefamulamogopowovab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=principles+of+accounting+solution+pdfPDF 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_off0000c2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EB 10896 bytes
SHA-256: cfe868f3281fbe4997bf4bbfa547642b95ec4a5a6f0b473a5134e0ad0d8dc913
font_01_sfnt_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 16708 bytes
SHA-256: bb65036cbd5dcf71d000b7e7c9c41b2539bcda8438f7783d46d3bb1276d5ee5c
font_02_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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