Malicious PDF — malware analysis report

Static analysis result for SHA-256 938ae8e8a407a66e…

MALICIOUS

PDF

88.8 KB Created: 2021-10-06 13:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebc520a520f1f35b4190a8f79f679e59 SHA-1: 24b551e40fa72b746d24e59a2dab3708516e4abc SHA-256: 938ae8e8a407a66e38e235d034797a2384639b1811d7b36573cc90a0ec8e2a3b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with several heuristics flagging it as a link farm on disposable hosting and containing algorithmically-generated URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=50+idioms+with+meaning
    • http://ruihuitax.com/files/file/zopugobaxofosuvejixorijet.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614058ba33df3---25882854839.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/zulajojowupuxijunoxu.pdf
    • http://www.hydro-tg.pro/upload/file/puguzevujodesade.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/24852284390.pdf
    • http://lagrupacio.cat/file/65685329928.pdf
    • http://dobrejaja.com/Upload/file/70681449616.pdf
    • http://terhautz.com/upload_files/files/juvusab.pdf
    • http://pnlestari.com/visitbali/image/files/saverefovegobux.pdf
    • https://konchris.com/userfiles/file/1632233422.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7831e68a52514a20c9237bc3b92d0744/busakiwokapix.pdf
    • http://journalofcritique.com/ckdosyalari/upload/files/xozadufuj.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/43681796366.pdf
    • https://it-remarketing.pl/app/webroot/media/files/74146673638.pdf
    • http://autosvilar.com/uploads/ckfinder/files/61697727183.pdf
    • http://www.tobywells.org/media/fckdir/file/juzanidironuno.pdf
    • https://goooinggroup.com/userfiles/files/20210918_091730.pdf
    • https://globalcircle.club/userfiles/file/25549652999.pdf
    • https://csodamalom.hu/files/files/92946203093.pdf
    • https://pharma-tools.eu/galeria/file/82811781952.pdf
    • https://hoangvan.vn/wp-content/uploads/files/41275577323.pdf
    • http://veitali.com/upload/files/25314553236.pdf
    • http://blesk-stroy.ru/userfiles/files/simenafigipuwas.pdf
    • http://gazosilikatnn.ru/uploads/files/83374851535.pdf
    • http://pribatu.lamilagrosaimport.com/images/files/bopojotimenup.pdf
    • http://pk.mo/userfiles/file/vataweretelodov.pdf
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/82764089292.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 16792 bytes
font_01_sfnt_off00010ab3.bin
4fc7e9692bdb86edfeb89086538c64657a8d5c2c19719c6931e11899064e941f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 19324 bytes
font_02_sfnt_off00013cf4.bin
e6d989c50fbeccdb250b53b915365cadd687339f8958efd859ee5c3484b9712f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 10796 bytes

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