Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b56872d85b1cb2b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 06:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3efd07dc0104ae338e5c7a85a534742a SHA-1: a5d02afb9c4d36cc4569d9c81760c40c5356b61b SHA-256: 1b56872d85b1cb2b6f99483651b48d9b24023dcf7477bb844618ccc6ef1d87bb
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It exhibits characteristics of a link farm, with a high number of external URIs pointing to various PDF files hosted on potentially disposable domains. The presence of embedded URLs and the PDF structure suggest an attempt to lure users into clicking malicious links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://chcial.ru/uplcv?utm_term=nimo+for+streamer+apk
    • http://geoscan.it/userfiles/files/27398016152.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f64ff2a093e4ca0041fe19112698341/8659989163.pdf
    • http://rewitex.pl/userfiles/file/damobewufutuvogujif.pdf
    • http://azseal.net/uploads/userfiles/file/79243728208.pdf
    • https://villanakarin.com/userfiles/files/21952167401.pdf
    • https://dehayemek.net/upload/ckfinder/files/minovafa.pdf
    • https://alate.org/admin/fckeditor/editorfile/1262739758.pdf
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/4181172257.pdf
    • http://kdbelektrotechniek.nl/uploads/file/nunaburatebewe.pdf
    • http://travelci.ru/ckfinder/userfiles/files/xarukizavotijopumabagoget.pdf
    • http://standardamulet.com/files/files/4986794640.pdf
    • http://pospatrans.cz/UserFiles/File/wefemilogi.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/lirumogorasobufakoz.pdf
    • https://baigiangtoanhoc.com/upload/files/74172532965.pdf
    • https://hattoco.vn/images/ckeditor/files/nujivunilivoke.pdf
    • http://worshipedia.net/sites/default/files/file/lalirejexakuralewemupuf.pdf
    • http://a-b-i-s.net/layout/bilder/file/88352630738.pdf
    • http://mt-filtration.com/uploaded/file/75557963613f0d64a307e.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd67aae194---taxonefuvozuli.pdf
    • http://mkngsp.ru/upload/files/24162305773.pdf
    • http://robalton.es/Albums/images/file///48082324234.pdf
    • http://hepiran.com/cache/fck_files/file/giledeza.pdf
    • http://hatowo.com/app/webroot/uploads/files/49641963577.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 16792 bytes
font_01_sfnt_off0000ce18.bin
a6a673d169431f0436bdd15aae20c33ca6ad2ae678b82b2fef5892a9353c4be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 17388 bytes
font_02_sfnt_off0000fb15.bin
b601cbafbcdba2cb5a5a8e6b78b124ef0041ce31f7be4a88806529e0566945a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 10440 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.