Malicious PDF — malware analysis report

Static analysis result for SHA-256 696043a4af09806c…

MALICIOUS

PDF

102.6 KB Created: 2021-09-12 22:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1f644e1b133cc36d31176972ea815fcc SHA-1: 70844b7e47f17cea11aa9b15203c2e0c07e59d47 SHA-256: 696043a4af09806ca60fa04f9567b63dfe54d601d39a3ae364cdc22e7eff35a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://aldapa.eus/files/galeria/files/35687623820.pdf In PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/16610463005.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/pupokafi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bn88at8r48nd42tbrhns6nfcd3/53422724699.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/20617742286.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/76591717150.pdfIn PDF document text
    • http://halaljones.com/uploads/files/radejanagu.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/91256968127.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/29483646848.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/39819823307.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/zivunawokukazusefumuda.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/29688936389.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/gebewejojavobaz.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/91043214615.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/46380380586.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb6be618f---wugagoxodufapa.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/likakogemodi.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/xexilujo.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/31301727195.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/kevage.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/mosoxezumixoko.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/gorizuwogidakatezud.pdfIn PDF document text
    • http://dongphat.net/upload/files/50891723988.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/42407290932.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/70030713055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=21+and+over+123moviesPDF 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_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 20912 bytes
SHA-256: f3bbb0f50704d22e34e2919ade70fc9cf6a0af4ab469b5d5ce5d57e55f499526
font_02_sfnt_off000174bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174BB 10576 bytes
SHA-256: d2f6045650eb506049b3bae6bdd06056ee2e70c87d7d758bb2ea6ed30dbbfd74