Malicious PDF — malware analysis report

Static analysis result for SHA-256 446f0f2d24818f9e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 19:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8976f7752b38c4b6a913b3e089715024 SHA-1: 53ad4dcfd923fa819d63deb08e6286557c7d6cab SHA-256: 446f0f2d24818f9e65557de244d57f2ee96d1dca4aaa9c091cf83f9242096a07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external resources, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The PDF structure and the presence of external URIs strongly suggest it is used as a lure to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://wastran.ru/uplcv?utm_term=movies+android+games PDF link annotation
    • http://carrasvilla.es/uploads/files/raguritizavez.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45902685596.pdfIn PDF document text
    • http://egitara.com/upfiles/files/vinanez.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/sasedusirewadovalilas.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ee7db842---421826120.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/57408980892.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/fiwifotunelaxuro.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/73831367858.pdfIn PDF document text
    • https://sealskinz.ru/files/file/32491428118.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/bagikedoziwimujopu.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/2274943218.pdfIn PDF document text
    • http://sakem.org/userfiles/files/51832121258.pdfIn PDF document text
    • http://dsagco.com/Upload/file/45106939350.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210907_034523.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/ginizukopisudufodawomuve.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kudez.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/43825622419.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/vidovezexogugugonifon.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/tolama.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354e3bd6bdf---nirozum.pdfIn PDF document text
    • https://lapdonline.org/file/42695402162.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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 17332 bytes
SHA-256: 25d27b50e907f7ced68df66207c43744f83498057f18f290b6c01d6b16de8459
font_02_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 10508 bytes
SHA-256: aeacde8a469372c8cca3eaceb9da67006f210b813af23eccd02f70f090a9b457

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