Malicious PDF — malware analysis report

Static analysis result for SHA-256 865170943e247d90…

MALICIOUS

PDF

118.2 KB Created: 2021-10-07 13:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 17879e1dc53da3a2093ba29c51de9aaf SHA-1: 51cbe0a3cf7b9f4e600c4e77fce8d40be00058e3 SHA-256: 865170943e247d90907d29f3ce1ddc84531fad0fdb42f2dd960e842f6f25b58b
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 functions as a link farm. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to PDF files on various domains, suggests an attempt to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://goldway.jp/upload/board/file/11587105843.pdf In PDF document text
    • http://trieuduong.com/images/Download/lixamakojamaxuxusisinez.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/xolibora.pdfIn PDF document text
    • http://pololanna.com/user_img/files/jefugigibubowedevemavuz.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/mubobatusunixepogosipi.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lonetalavurebubizemejata.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/85117863173.pdfIn PDF document text
    • http://placc.info/up_image/piwuviliriranunojuj.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/68451697667.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/fofezetakuwugin.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/nedozot.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tiwaxotatejofoxifaladixi.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/6530485912.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/27587871673.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/14751028118.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/rupasafowutadu.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/lojute.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/wazaworugurovepisex.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/26097671933.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/81110701024.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/zibaladuneguwokiribese.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16155caac676ae---zezikomopebitivulud.pdfIn PDF document text
    • http://potlista.com/file/files/79198506903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=local+beer+breweryPDF 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_off00016457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C6E 10060 bytes
SHA-256: 9bbe429f41644c3de6a6ac6c2e2872fbb71868dcbd5327d35c77cddb4509aa2c
font_02_sfnt_off00019300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19300 21872 bytes
SHA-256: 682cd6047242f90e718e92b23af9e97fce56551745f2b1a56a03db93c8fdbb6b

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