Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63a1228a046b2b5…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 10:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2293ad63d090dcef40a03e4b335bc3cb SHA-1: b3b05a7691dc00425c4c8655237c50fe1fca1d5f SHA-256: e63a1228a046b2b51041912b3c0c359f566e9036ffedc8a5c2e89e24d43493cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the true destination through a large number of distinct, disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://dulichtantai.com/files/uploaded/files/75681520651.pdf In PDF document text
    • http://synergyproperty.com/images/files/kedabumitujuritutixadur.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/3141903998.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021092418306_585555447.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/8576889764.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kelana.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/7175725181.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109131057382586.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/guwagitojutokuxikivi.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/49148505377.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/78701367757.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/79779055883.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/82418144327.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091013531373499.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/mawekomogi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed77ae3644---69591320814.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/2012410390.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/578270357.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/lodezejamovabut.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/bajajus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=app+is+not+installing+in+my+phonePDF 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_off0000ab4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 15480 bytes
SHA-256: 4fe18b9bf697f1b0bc80078ed17793e00cb862e09d85eda04eaf1fb0d12da2a1
font_02_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 10696 bytes
SHA-256: 81da6cd052fb8abdc3ed8fe698ff6b06d383394bf3f45be9f4c80d757571defc