Malicious PDF — malware analysis report

Static analysis result for SHA-256 1964ecd93c6fb559…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 01:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f527b5413e91ece18db86cd9e3dabdf0 SHA-1: e6b95003d8c493adbaff969ce6c257f6dd832c4b SHA-256: 1964ecd93c6fb559517505c2349aace06e7cac756d358cbfa7d751cb8bf2dda5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://radiosmile.hu/upload/file/50873019053.pdf In PDF document text
    • https://tumujerrusa.com/userfiles/82360321766.pdfIn PDF document text
    • http://cudicio.it/images/file/woxuze.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091703450791666.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/gamotowapa.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/37008582961.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1384528c---lonukofefitiwawujati.pdfIn PDF document text
    • http://huefpdf.org/upload/file/lapamixexiwebijama.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/84063523202.pdfIn PDF document text
    • http://iphysiology.ru/upload/69252583958.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/luguwo.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/mefixila.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/9787227576.pdfIn PDF document text
    • https://umutfm.com/resimler/files/neguzosomi.pdfIn PDF document text
    • http://rs-entp.com/upload/file/94330085263.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/poxalawibosuxikufizex.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/falumedutovapetowedomi.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/57532829806.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6aptuj6ttcgburorfa2ojldh3/genofunizureka.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/kimebuwunopozox.pdfIn PDF document text
    • http://klenderbio.com/upload/files/77229944891.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/86835681279.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/ragovogawakujovipikokibub.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/44662837378.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/bidopadivejubezafil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+watch+borat+for+freePDF 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_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 10240 bytes
SHA-256: 1e3e53ce3faf929b2ff81864f716806b887bb1f7d0ba4c8eef115ce39b26b438
font_01_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 17880 bytes
SHA-256: 0d604b616a505dd606a70748a6c22e18dc034cd2a7e67afb7afea89f3a2d2ac2
font_02_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1