Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dae80a4b4500a8…

MALICIOUS

PDF

78.0 KB Created: 2021-10-04 15:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b9483e933fcecb9e3536d79c56483d4a SHA-1: 4eba778cb4e99b7749b2fe71d390f5d5315f436a SHA-256: 74dae80a4b4500a8ba6c38fbc9ca2e17e5bffca483d934d86e6e7d86d0dc6ea7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest it may leverage embedded JavaScript or exploit vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/81c09735ec6d1c00ffc7728072641844/noxawazijopa.pdf In PDF document text
    • http://ambvetesopo.eu/userfiles/files/mogedufagedejakeruwexexo.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/12079707723.pdfIn PDF document text
    • https://atiksigorta.com/files/34203748564.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/68202435854.pdfIn PDF document text
    • http://santabruna.cl/upload/file/retirek.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/doxavomuborifox.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/lazigepatava.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///pixawopol.pdfIn PDF document text
    • https://foulardfotografando.it/file/45508587972.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/vorusatixumonagivoj.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/gadapuravoru.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/16505857521.pdfIn PDF document text
    • http://shesob.com/file/files/tajebetinedefotowa.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/pimapivovigopelane.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/20208222143.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-3/20210903011754365529.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/85974160534.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20211002_DB9CCDEDCEA75B88.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161587b1b13fb4---82147304147.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/jujilobuv.pdfIn PDF document text
    • http://aweibel.com/Photo/file/94456288614.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/rokurowaxegapajir.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/lajeliputujijaxolasa.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/gudanowukapukuzon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=elements+of+information+theory+2nd+edition+pdfPDF 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_off0000c91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 18504 bytes
SHA-256: b519a75574537416184e808d862c214d9a8b0fcc2d4632d2ceeaa63862c8a530
font_01_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 10980 bytes
SHA-256: 9d7d2788ff9b9878f7d949e1a8ac2da6e1c8beef17c09272d5d755891a0985b0