Malicious PDF — malware analysis report

Static analysis result for SHA-256 da167294789d6b7b…

MALICIOUS

PDF

64.0 KB Created: 2021-09-10 13:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9e3a3d6aeaa2ef58aab9292316194b6 SHA-1: 129bb07cdf615546970b85e9062365541b7397d0 SHA-256: da167294789d6b7bef85bf24f8d306ea1f8e59a443987ac57545438c7b903c27
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 4

  • 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
  • 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://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/kelufir.pdf In PDF document text
    • https://whiteplacard.com/UserFiles/file/93197248602.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/70385575622.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/71282553055.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/domunu.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/nibusi.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/41016879256.pdfIn PDF document text
    • https://manenshop.com/upload/files/futizulibedaxipax.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/8235725112.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1140440634613222ff8ff6f.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/68938907878.pdfIn PDF document text
    • http://freestyler.cz/img/file/77203122510.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/55632300092.pdfIn PDF document text
    • http://jucal.es/images/file/15468287464.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/48628892450.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/58001091688.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/39305417386.pdfIn PDF document text
    • http://maksimetall.ru/files/62349560479.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/wupojikomutujapolirup.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/makibetuvujurizevebutave.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/dm9fbji79bl8876osljjfqrfa1/dizanorupi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba246a89f---titiwirujidumi.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/9614820879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=druck+watch+online+english+subtitlesPDF 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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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