Malicious PDF — malware analysis report

Static analysis result for SHA-256 73aadf866aceaea0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 02:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20d016e225cf2d066fd4472432625d02 SHA-1: 12e7820a8c5114b8b197e64a070d9c6a946010d5 SHA-256: 73aadf866aceaea09be47d924245b88dbacb9f1553639c11ef8a15e01d0fd64c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to various unknown PDF files hosted on potentially disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 http://ikuma-car.com/js/upload/files/vakudajitisedizaf.pdf In PDF document text
    • http://murzilka.biz/images/uploads/file/29594897944.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/mubagiturag.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/valijuxadirezinogukok.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/90965276519.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/wovufepato.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/80376584380.pdfIn PDF document text
    • http://erdbau-rauch.at/24511505525.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/najobif.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/nisesexuvejejofebonejo.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/masetulifegiwomimosoxoxo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/883f0ff2894e7e987f7c343b91d9ca55/sijazififekuw.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/31401831395.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e26909db---zetekisuxisonisa.pdfIn PDF document text
    • http://zzquansu.cn/d/files/watelagifi.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/lerimejubiba.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/13712360988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=writing+to+text+app+androidPDF 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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 17652 bytes
SHA-256: 330752aa3c24085be6577f4434db29257e97bab1f9b99eb0e78e3b6edc730ac6
font_01_sfnt_off000114f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 10448 bytes
SHA-256: 023f8394f20a7b335a2214b1c0487bf6b09940199abdd0ded2d836d45911dda4

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