Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0656e76038af33a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-27 20:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6389efd3abc415a2921e494d0534ebc8 SHA-1: d65c334621efd8cdcdc5fbe33697e6a7ecb67821 SHA-256: b0656e76038af33a44002426e7ca47c977b24362553fceb2142772d7f84380ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a phishing or malware distribution scheme. The primary attack pattern involves directing users to a collection of links, likely to manipulate search engine results or serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/watixevuguxajonedebiki.pdf In PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/dawivof.pdfIn PDF document text
    • http://scro.ru/pic/file/jiwudu.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/58493117555.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/golafuvujo.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210903120233_gdgvm8.pdfIn PDF document text
    • http://boldogelet.hu/media/jaxedexozoguvaj.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/wokire.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/33562803784.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/98821573679.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/wuwugarazuxiviwez.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/jedevawidarugakiba.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd2d549190---zodux.pdfIn PDF document text
    • https://123natura.com/stockages/files/37729972629.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/63181377526.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/molulikavijetezisebimop.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440fca1ff4b---33444093306.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/36731986671.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rejifotozowozuvokikuvako.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/6686430211.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/nosoxiloxowalegi.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/bosunuwo.pdfIn PDF document text
    • http://poultech.net/d/files/64005034087.pdfIn PDF document text
    • http://xsteelstock.com/d/files/22872986890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=engineering+fluid+mechanics+elger+pdfPDF 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_off0000b869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB869 20340 bytes
SHA-256: 589b188009ce337f3eb446adb306caa0d3c32f55e1c5e12ab5abf1480d697d9b
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10932 bytes
SHA-256: eeae734b60726ef33ca5cd799573e8f77f954c4e3d0d6ef465f47081538cef00
font_02_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1