Malicious PDF — malware analysis report

Static analysis result for SHA-256 432526411d22a405…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 22:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5902b96a6d0b8ff0c1805946f26395c1 SHA-1: 4b924c3f73eb67b73678867917682e17120e5c2b SHA-256: 432526411d22a405d461d6016d74a1e800d3b2af3f4071295264940826360e8d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to potentially malicious PDF files, indicating a link farm or redirection scheme. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://regmac.net/userfiles/files/50972373201.pdf In PDF document text
    • http://iscyber.com/userfiles/files/vanuroxiditatotiwo.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gipakuwevoxeve.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/29734517357.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090302532934.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/04/file/48670960444.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/61320839318.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/zikudixileladazoxora.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7m43c9t2g3glkkff6gvhaa3p4i/44586437556.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/minine.pdfIn PDF document text
    • https://ka-base.no/images_students/files/begatufagi.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/migagunenuzotorej.pdfIn PDF document text
    • http://newworldss.com/uploads/file/lavuzejiwaxijuroruwazaru.pdfIn PDF document text
    • http://synowka.pl/galeria/file/zakikinuj.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/lewuzipelagozifisup.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/zilenumuvowaledorojudo.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/fijepidegoginujegav.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/84388816631.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/buvubagesemuxanaj.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202194946438637.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/61398228343.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///mabolagewifavipixagid.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329bad76e20---93818611548.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/vexaw.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/82859057790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=camera+360+vip+mod+apkPDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 10788 bytes
SHA-256: 2f2b2aab8d6404a546ce7df264e4f459e126dc6b649a1989a774c37ec9f08dc3
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 18968 bytes
SHA-256: 587da1309700928fe9d33c9eb913ed915debddf08f405cdfac02b8380172df91