Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e8881d0c73e285…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 14:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0065c799d052e44e1713edf282650b2 SHA-1: 2e6b9152a66c27d4a2bd64d2f6d7b764959ba792 SHA-256: e7e8881d0c73e2851a7f05d3c154fde20d85d3aa7f77526493aa08def82153fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b0ba129387b349ba886eb32161b26449/korakimuliriket.pdf In PDF document text
    • http://vrakskodamnetice.cz/file/80968863407.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/wetekanumobejobebafujuj.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/27338605536.pdfIn PDF document text
    • http://sro52.ru/uploads/files/lakomilagujavasil.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/30893123628.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/xipiramekovu.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/5096264400.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/25134020877.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/45987208144.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/21595539734.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/boxerepa.pdfIn PDF document text
    • https://kar360.com/resimler/files/xajabewerudolepovixi.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/99140444692.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092419462373499.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/72329708008.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/30853238504.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/2126503739.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/12491132611.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/34778716571.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/97093330345.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/kutuvimirobiramiz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613410850b076---41465599928.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/65638106499.pdfIn PDF document text
    • http://texmet.pl/userimages/file/38666154057.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/98886135477.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/73208600984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=juicy+mp3+download+musicPDF 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_off0000b61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61B 10808 bytes
SHA-256: 4763d6905a84b4bd9b26e2288e881f13b10124c5083c1cc536406632e173d159
font_01_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 15076 bytes
SHA-256: e53b25ef07d74f6a8b27281c8e4f02e0643d20aa74957689a59be3dc4aafe0ea