Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b36f42db68c6cc1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 13:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42d286ffa810fd0a5b55e5748ed2e640 SHA-1: 5df9113b751ca820f8c1c8102f4fe06429a6186e SHA-256: 9b36f42db68c6cc1d1af3ce77bcf64f5412eefc3975413c8dc386368a6e59f3b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the sheer volume of URLs suggest a deliberate attempt to create a link farm for malicious purposes, likely phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=how+to+turn+off+double+tap+on+android+phone PDF link annotation
    • http://www.heksan.com.pl/file/54117119014.pdfIn PDF document text
    • http://dejede.com/userfiles/file/50915460300.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/70125248740.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c0d045e9---23352039244.pdfIn PDF document text
    • https://baglab.pl/galeria/file/84673777630.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/kutam.pdfIn PDF document text
    • http://lblussana.it/images/file/71696701800.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/9772847286.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613082ec9702d---86766580791.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/70400513.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/jinaduvibitizibebofekave.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/61488190139.pdfIn PDF document text
    • https://ambalatender.com/upload/files/liworigiratevotifofigum.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/pilolalosurelatidogabelef.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/35210453717.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/nunibima.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/dugavevugarujisivap.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/77840833307.pdfIn PDF document text
    • http://co-mit.com/uploads/files/bexudubefemipube.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/59217363409.pdfIn PDF document text
    • http://aimic.com/userfiles/file/nelikutemugu.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/duvuledoru.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/29008776513.pdfIn PDF document text
    • 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_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 10744 bytes
SHA-256: ef7fad275646bc6d0f69d841520bc5db2b8aa90b96255a5bc637e436bef58873
font_01_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 17700 bytes
SHA-256: 3168a8bf035ed510a7c1ea33fed33d58c6b0d4b7973d398b4b01889e1238cf96

Open this report in the interactive analyzer, or submit your own file for analysis.