Malicious PDF — malware analysis report

Static analysis result for SHA-256 224e7bfb5a754197…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 20:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: a0e25584f8ff3552cbb4cb324e1e4395 SHA-1: 5f4946e4bbb44668b82f7465ab9086527b9b49d4 SHA-256: 224e7bfb5a7541976426aeb70582571d2a36e7cbdfdd6617637350ad4f30b206
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs, many of which point to disposable domains or potentially malicious content. The document body is heavily obfuscated, suggesting an attempt to hide its true nature, and the presence of embedded PDF objects further supports a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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://digireg.sk/upload/59556795488.pdf In PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/96271431881.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/zemotitenelatosa.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/wefanogi.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/fezeniwojetodoko.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kujetotadogono.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ef60ef8273a06984ece7b91d370e0d6b/62142603499.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zejikizidor.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/62138593448.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dekejiriwedup.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/59161072325.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/vobikanumupapubewaronola.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/gikiregemepudivupuzo.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902035814.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630588442.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/repigegozavana.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/5932711256.pdfIn PDF document text
    • https://krusomying.com/data/file/teruvavilabikunenuzel.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/371309758.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/takimadexadejegiboko.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/siwejebagefuxute.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/93225015143.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202192_42957_678.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/pibokadagivirutaloni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+scheme+of+work+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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 17332 bytes
SHA-256: 1ce8c4ebdfd983e3c65b453d7b75d3a36e04b4591dac4952df7a0cb35d3de03a
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 10856 bytes
SHA-256: 9324eec5803d244a53495e013fb5cfbe12a433e88c069f20778bc4416cd01248