Malicious PDF — malware analysis report

Static analysis result for SHA-256 564e32c11d360b3f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 12:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f6c79a11ae9b83c370a02616062ea2c SHA-1: 77336fce877fafc256d46998598096df7073b502 SHA-256: 564e32c11d360b3f0dc72a300f52bd1408fb4844e4762aa342212551eb228f51
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 other PDFs hosted on disposable domains, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the nature of the PDF and its embedded links points towards a malicious intent to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://songod.vn/uploads/image/files/65281366193.pdf In PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/74087553586.pdfIn PDF document text
    • http://finchamauto.com/pics/terevuda.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/leridopazemipavusapifil.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/76266713502.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/kurubovek.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/12247919217.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/luridusimegizugo.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/81341975392.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210909072359.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/33687886070.pdfIn PDF document text
    • http://parfumland.sk/upl/jozuw.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/21637354013.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613380e3a0d6a---ribavimozeborodilugutoxed.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/mutujap.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/35805128480.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/xatudanitasunufagoluve.pdfIn PDF document text
    • https://menu2uplus.com/images/file/34114641176.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jirosudezud.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/14354252985.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/tulivupobijenavemigalux.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9rv2gohsl0tgafjfh5mj21oih3/wotike.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/41015455156.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/wilutafafifodakalago.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/29585475684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=play+android+games+on+linuxPDF 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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 16980 bytes
SHA-256: 4daa529f8cc4247f672e7d7588b3460b8f9042ac115db5b4c11516aa968b0bf7
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 10808 bytes
SHA-256: be5d7a66446c9c54e11a5f98ede7067850957ebd9aa225c28173b966a8320e36