Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e15cdcffdc9b18…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 02:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45615bc136bb56b8309ed52a15580fdd SHA-1: 017373b2a944f8a19653edb8a16e98a743f9c089 SHA-256: e2e15cdcffdc9b18e2c6313f9cd920183eb1bb9cc18df96a4902fa50c8c6ddd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains numerous links to disposable hosting, suggesting a link farm designed to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://volnynaklad.cz/data/file/83658323162.pdf In PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/butomigozarilelebi.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/davuboxapopowajumumonid.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/wulupedut.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/lenazipexivedomufu.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/14712541378.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/22538197301.pdfIn PDF document text
    • http://mega.kz/media/upload/files/17852139724.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/49917487454.pdfIn PDF document text
    • http://th-hl.com///upload/files/zafux.pdfIn PDF document text
    • http://contua.org/userfiles/file/zoxidagusukilejiponom.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/16484169942.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/ronaxedigi.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/kujuvesonunakofuzumel.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/91831470656.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/sifuxovumefusivoruxuwowo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/25hsg3mm0ehgl03j7qqbme4t2k/75545643140.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/gadisogisinagep.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b71ee1155e23e63dd333915a792caec3/64039768632.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/59251729169.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/81620963756.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fimufageti.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/93618136641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=universal+truck+simulator+androidPDF 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_off0000b1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 10796 bytes
SHA-256: 6ead830ab9db13894764c3e28d0bed9c24b8e464bad865791100c9f519664118
font_01_sfnt_off0000ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 16576 bytes
SHA-256: 8e20918a3f3840f6c6fc3d0e3b3fafb3313d4b925244784aa12c0d2932e6d34c