Malicious PDF — malware analysis report

Static analysis result for SHA-256 4811186097b0186c…

MALICIOUS

PDF

51.6 KB Created: 2021-09-26 13:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1acfa10fe67c3193e7383fa853cf76e SHA-1: 33f1dd19aea07b18a1d8e7a074be8da2714c6680 SHA-256: 4811186097b0186c688d3401485c6c46cf09552bb6bfef7bedf36dde9288edbd
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous external URIs suggest a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8589

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.
  • 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
  • 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://orderbestwings.com/uploads/files/52086948441.pdf In PDF document text
    • http://kmjmt.com/news/upload/file/2109070445170837720whfa9.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/medufuguwuzepagozolunido.pdfIn PDF document text
    • http://clingac.com/d/files/gimebitegap.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/nubekegej.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/22622141115.pdfIn PDF document text
    • https://alohasafaris.com/files/27334672730.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/89766795123.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/5073592732.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe381cd67f---45298429891.pdfIn PDF document text
    • http://jcpingie.be/public/files/93268383045.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/16873427448.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/jiwutezonadivopawamijev.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/41781851625.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/texidobofezewenulevej.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210917042551.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/janituwurivilikilo.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rakukajosem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=after+effects+2018+full+crackPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1