Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda129e30cf52c0f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 22:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8186fd7109fd229486cc7af45f4510e7 SHA-1: ab025b331fc84bc15a223ae038be4564d6c98c47 SHA-256: fda129e30cf52c0f590830718819fe58c94d62b8cd53b2553e237cf25a57a638
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of external URIs across various domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=first+and+last+name+for+malay PDF link annotation
    • https://pikhospital.com/ck_uploads/uploads/files/4135090708.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/37556745901.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/92298389114.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109181931476416.pdfIn PDF document text
    • http://domosplast.hu/files/file/dobufebuzule.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/revokoparuragupugodutu.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/44915229206.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb93812f8---gozosufisoterelutumuv.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/3939435000.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/lomowotabirerudijili.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/79443144873.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5b5a46d9---79511448011.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///74922494092.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/56434467740.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/biwijenaru.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/wakiwuruzubapixejijalum.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/52784254080.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/vivudu.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/zutitigimekewekavojew.pdfIn PDF document text
    • http://trovas.com/userimages/97332319944.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/43839913325.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/88696547528.pdfIn PDF document text
    • https://webrobogo.hu/kepek/82835823649.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/36419158849.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/tuzafab.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kilepupimaxasekade.pdfIn PDF document text
    • 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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 10608 bytes
SHA-256: 7bfb32f8e3414890540818135c6b77d3aa96517ff5e5b1609a24207ca375b21e
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 19452 bytes
SHA-256: da71a409e5512881b55f0a1b5331e63407d448f7d774e5d016d0137b0d015554
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1