Malicious PDF — malware analysis report

Static analysis result for SHA-256 529fef5d2dd6a091…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 20:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c278c241fcca0db1426bed947ad22821 SHA-1: 2eb7285128c852519064f718b6827b03cb1ef375 SHA-256: 529fef5d2dd6a0916e4441950f3305a02ba2354e84846ad4172f85801c239696
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://i-chat.tw/js/ckfinder/userfiles/files/keroduvapuxewatosujosak.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ec283125400ffde9d70126fdb6d75392/fefibezomo.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/26585090045.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/48464531913.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210907004853833511mtc98.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/fotuwukovev.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/meriziditinob.pdfIn PDF document text
    • http://kd-council.com/upfile/files/45943640891.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jozovuxopoxilekozaduzaxo.pdfIn PDF document text
    • https://digireg.si/upload/51521960605.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396476d433c---3157273328.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/tileveninabiwazosofetunep.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/64624041208.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210908074345.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/29325866754.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/20819961216.pdfIn PDF document text
    • https://onlinendttraining.net/files/93575692358.pdfIn PDF document text
    • https://krusomying.com/data/file/nazokodilob.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/pusuxe.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/dobofadokamopijowivufeme.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/98959120851.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/guzatowinenosugofe.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/62332766442.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/44879183930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+1+among+usPDF 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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 17296 bytes
SHA-256: 7a4a1b7aeae9cfb7d50da7cc81c96629f503e0a2c460275075409a117decb3e3
font_02_sfnt_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 10448 bytes
SHA-256: 6f3048bb2687deabd466bba6b4e8aa73a679285b4b628a315494b8f4d50f6a28