Malicious PDF — malware analysis report

Static analysis result for SHA-256 009458610971d530…

MALICIOUS

PDF

88.7 KB Created: 2021-10-10 23:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 255ea00187a4d66a6ed6273fa9a6d238 SHA-1: bcf1d5a20f15cc06bce7ab8505fc14a9e3e408eb SHA-256: 009458610971d530cd9b02d8fefb52e46bd94ab50f318a6f605ec81a956510b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bisleriwheel.genefied.co/ckfinder/userfiles/files/xanurifeseloxu.pdf In PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/17492263779.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/faxolopewozozavez.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/78476110939.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/xurademokananukejij.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/rizusaledijifilefugos.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/vovali.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/68994340449.pdfIn PDF document text
    • http://actinq.nl/upload/file/xetumu.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/76490275754.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/78214524802.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/99142885525.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/58168110021.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/39730810030.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210926040426.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339d2edbda2---piramozider.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/91249331925.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/jetax.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/lisisezuwesigatidejim.pdfIn PDF document text
    • https://medtek.vn/storage/file/1900548028.pdfIn PDF document text
    • http://midospa.com/upload/files/xarawinokizimifuvevu.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/55673887192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=places+to+go+in+nottinghamPDF 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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10576 bytes
SHA-256: 1d0c09804caf22be5a2dc11f446a010fe80aedfe1c18ce1b4e2863633a624b92
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 18800 bytes
SHA-256: c2ea267a742fa3d0cb456427d582c6d6c3c094217236837825516252e0c655ab

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