Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d587e583bd1046…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 08:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1aeb52a3467d7306879709f5a61fcf79 SHA-1: 7867d372e53b2bdb5220980d81ff8734c6a20c5b SHA-256: c5d587e583bd1046400864fcdf5a3a8d0ec3d9a7813b53443c48de21447f8700
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://alajwakh.com/uploaded_files/userfiles/files/polajuranokaru.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4ef279d90562182b4d6e07b27bdfb8d4/jomebixurexesofe.pdfIn PDF document text
    • https://tekartltd.com/upload/files/69334647009.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/86913658374.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/venusowitusofosijojenob.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/56802019278.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/40124505245.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/moworusixilo.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/60878665681.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/xovamamekeveputuguduwu.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/51203488425.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92860037026.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/42008989422.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/turizorabule.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/27090818936.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/40763762825.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/81831044075.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/nonifojobejowetazemuro.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109100611255983.pdfIn PDF document text
    • http://shahgrp.com/uploads/mavevuwokonudodig.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/dixajepawudafoxawasoniwav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bo2+origins+fire+staff+upgradePDF 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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 15816 bytes
SHA-256: 9a010e74253989f78b6d2b15480459b4a40d8e050353b923ca6b562056d7f79d
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10900 bytes
SHA-256: ea4da4a9a561efc42996c788cbbf86927b2009359f488b0d3ae9b215d16762a6

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