Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48cf11a819c63a1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 06:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e9f3c2fef077795b83a919e4797c0e8a SHA-1: 6d1b15c77f55c2c56ec22848627c5ef396e3baa8 SHA-256: b48cf11a819c63a1016b546efd6aaf3d422e0535430e5f8cae1df644ab983993
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to external domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and link farm characteristics indicates a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=t+mobile+unlimited+high+speed+data+plan PDF link annotation
    • http://tunesistudio.eu/userfiles/files/jusij.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/33881380448.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fc178747n74f0asdh4792ro4u3/28440556015.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/korewojetoxabifibejovob.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/73696982593.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/dumidipuf.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109241633543295.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vofawisapanutigewunis.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifon.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/9535998067.pdfIn PDF document text
    • http://thecuriosityshot.com/66329371725.pdfIn PDF document text
    • http://shosholoza.de/file/bikeresuv.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/delikugixozutajunerafita.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/tanonofafazoderotewe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/42740347525.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/5459743291.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/37388598498.pdfIn PDF document text
    • https://smilewax.tw/uploads/files/202109222027426709.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/2469124546.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/89309966239.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/texefubaburobokofujuna.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/91750173597.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/25656268917.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_off0000b53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53E 17548 bytes
SHA-256: 6dea74c76e965c46dc09c0a4225941cb92a701471b2ade2dfa14b63ccac5aa05
font_01_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 10944 bytes
SHA-256: 3c3abf00059efef9ce08f544a32b2b504613ecb758226ff9bbd391430bd8fdf0
font_02_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1