Malicious PDF — malware analysis report

Static analysis result for SHA-256 d175ae5c5ffb9f5b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 22:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 120acb79b9b82b01d8048649699fd5fa SHA-1: a32014aae49f93c2f179cd140c52c679cd431200 SHA-256: d175ae5c5ffb9f5b1a4092980e3355ae1730ea2aea014b7d0d6fb734063cf0ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alda.pl/ckfinder/userfiles/files/92628273959.pdf In PDF document text
    • http://chikatere.com/Upload/files/35530506339.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/ruzowurobup.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/mogutijenevomibovon.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lizas.pdfIn PDF document text
    • http://www.bash.cl/media/file/22212285032.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/dabonawuz.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vetadibakunesavevu.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/juruvipubovixokaliwuxu.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/sibomolidoxexodafitufokos.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/xajivufa.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/91963024756.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313907c8ce4---pufulomogesem.pdfIn PDF document text
    • http://wohingltd.com/userfiles/70712392770.pdfIn PDF document text
    • http://ijfbn.com/editor_up/89751193848.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/051947121326.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/96539420650.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tozevugixudak.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///zapef.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/juzofumelowo.pdfIn PDF document text
    • http://etre-belle.su/images/file/35379704157.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe970a513---94338106740.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/90744662832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=self+confidence+formula+napoleon+hill+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/zuvifowo.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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 17828 bytes
SHA-256: 0fc6a23ff8824dcdd4cb36eb29d71b723b0da94c2d8f4caf59fa4d504be11a9d
font_01_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 10792 bytes
SHA-256: e312036fc2cb841f4a4a1381ca3be5b25076664b58a0a3781a2ac05877830f91