Malicious PDF — malware analysis report

Static analysis result for SHA-256 464ae9ac562c535a…

MALICIOUS

PDF

89.9 KB Created: 2021-10-07 22:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 024280f576937a666783f71eb111ced2 SHA-1: 94982f73fe176a1c71c234df2429f188e77bb01b SHA-256: 464ae9ac562c535a2cbc35cc638c1310584b063e21ed5d06020e6df167271cfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://equalland.com/uploads/File/jemotemupajenebuvabuxag.pdf In PDF document text
    • http://englandmatchshirts.com/assets/file/73935597315.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/37875979412.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/newine.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/fikeramuwipinivaxomu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8fh59e8oa1f2s7o1vhbr9a6mnd/xogunurodozobomarirolo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/wirugopemixugususavot.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/jipotar.pdfIn PDF document text
    • http://a899.net/userfiles/file/11271488955.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/40102031043.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/sotoso.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/70621920209.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/vijivajijupejefavekom.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/finoj.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/80970922509.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q2jab3g7tpp3m05ifhhd53f5q7/87760044601.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/49036920755.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/dinutebobelibawu.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/33197518796.pdfIn PDF document text
    • https://tarsiman.ee/files/file/48829917231.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/65823503077.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/tedibojeris.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+boy+in+the+striped+pyjamas+summary+chapter+1PDF 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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 11232 bytes
SHA-256: a6a9f13dfeaa3cd3461eb5cf4dae714fd755bbff9dcccc623be2945061211e64
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 21372 bytes
SHA-256: d6a36ba4eb7f55705ba2c638c4a6cfe945ff7899832f8d4d1768f9fdb0d4d9e8
font_02_sfnt_off0001416b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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