Malicious PDF — malware analysis report

Static analysis result for SHA-256 da78b5051671aab9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 04:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b739519db37a2a6179fcf59bc3a02ff SHA-1: 9d2a9042c9960c66581e7ed65762fa1b73e7fcb4 SHA-256: da78b5051671aab95ca8554dbd6c1cf33a3c57d97ffcdc8b43e02bd20648a09e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ginzaoakland.com/uploads/files/lazal.pdf In PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/13115057619.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/liwinapawitivufivetino.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/6025883758.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/zujamunupajoxexos.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/ramiralikabowaxe.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/zufevetalopoxopawawuxe.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/lenoxexabi.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/vixobusevowutelasijana.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/luset.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/vuzewezibimagevotibuzal.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/zakazuv.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/zuziguwin.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31538284700.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/64551147972.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/64857589740.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/ratudaxevok.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/kulisemonunafiragitafix.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/82533052885.pdfIn PDF document text
    • https://equinox-e.com/upload/files/modajopuku.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/buxej.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8ad5e37---24999893514.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161367694b3d58---buzubazadepazak.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/detadiwow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+open+an+html+file+on+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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 10672 bytes
SHA-256: 055118a2401a60ab87fe719d1233d0d2cc2d5a9885cd76ef9859709bcfcea0d2
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 18248 bytes
SHA-256: 0673b819e6f9aadce73b92b77ff65e265ecf82eaaee804b8ae4f83da6d1fd3ef
font_02_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1