Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cd4212518d601f…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 16:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15fac1cc9fd8e12cb1408530d8b4b49d SHA-1: 8269b84c9ca0a50dd861df4d561d83bd5b95844a SHA-256: 27cd4212518d601fb09d005162b9307a496a5dcd3acfb489fc5366a51d45588e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to distribute malicious content or conduct phishing attacks. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for hosting numerous links. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cosonhuath.com/hinhanh_fckeditor/file/55852859722.pdf In PDF document text
    • https://chptravel.ir/data/file/lidawixuv.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/40104423251.pdfIn PDF document text
    • http://nessium.net/userfiles/file/samedaduxa.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0583c2313cd5b9bb3033d28daa0ee45f/13113714252.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/16763408119.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/75176910306.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210905_0_34_25.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/bezafaxumi.pdfIn PDF document text
    • http://rurisnet.org/images/file/vozav.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/6492324457.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/zesoruwejoderolakematep.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/82008235194.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/zuriro.pdfIn PDF document text
    • https://0900107678.com/upload/file/desunoj.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/xizidipojikabisofuxog.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/salufivabipev.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/tenibewovunirosisejimi.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/nazotesemelemelurejodo.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/benume.pdfIn PDF document text
    • http://guowangcable.com/d/files/wifuwumuzemup.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/mixinudope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=network+selection+disabled+association+rejection+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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 10788 bytes
SHA-256: 177275bd6026fbc53de213d1b9d82a708bd8997205c381d23817e2538f243c91
font_01_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 19816 bytes
SHA-256: bf85d7201b6ffd751e795182aecc58e28c4a30382041468e7d3926c4abc83702

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