Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a55751413da83a3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-11 11:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3d74cb2e88793f9ef155684f3436207 SHA-1: be125ce2b3f09a7b136237e37f39ec3db0633b2c SHA-256: 9a55751413da83a3b1b090572af0b7a6eb432b4978765d195c7fa7ae30e7e2cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://russkiivopros.com/images/FCKeditor/file/30007907804.pdf In PDF document text
    • http://blackhorsesc.pl/userfiles/file/40623128463.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/26596692214.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/9905467822.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/virozewegosaloxanemize.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gasopokizobedamitotikenod.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/12823145573.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/kudazitewokimesesu.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/ziviturire.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133823d8746d---714508763.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/58643132197.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1f7d9f48---pesokakuvivo.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/tepujitiv.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/kudirevevo.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/pubudanagupawin.pdfIn PDF document text
    • http://apsons.eu/files/file/gitedidukoge.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/jizekexabawidubuw.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/bodijizurudafizedini.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/92962312757.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210907173500.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/tedulexusojujejowawuto.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/mojulozaxaxuxavuketo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=merchant+of+venice+translation+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_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 10776 bytes
SHA-256: dd316298f680cab52b3cc5a5b7ac224fa941ceaf49d442ce0aec9bead7365177
font_01_sfnt_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 15904 bytes
SHA-256: 6bdc3cb30b6a705b692841a46ffa84cbd497684dd07b171d7f1c80c0376acf5b

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