Malicious PDF — malware analysis report

Static analysis result for SHA-256 d488683cebee4552…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 05:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f65b6dedd311d3811c1f1bbf965a8f69 SHA-1: 192881887605bdea4eefa5e152bb1717df261cc8 SHA-256: d488683cebee4552a9c8257f0ba89b4d6cc0371f896461c4a36d621b542d9309
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 presence of a 'download button' heuristic and numerous external links, some pointing to potentially disposable hosting, suggests a lure for users to download further malicious content. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://www.leasebridge.com/CKUPimg/files/99420169332.pdf In PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/denebizexakizigusovotiki.pdfIn PDF document text
    • https://linardi.ru/files/file/58356106396.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/vekuraduv.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/gawukefo.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/wagexugubege.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/pibif.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/32756784763.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/nijapefaxezilefuvev.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/98598389570.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/muvax.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wototigozerurosebapava.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/49640518585.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/61645780358.pdfIn PDF document text
    • https://datajournonepal.org/files/44796882145.pdfIn PDF document text
    • http://thegioioto.store/upload/files/savadejosi.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/noperakotugizewowadox.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/91435814556.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/64655134914.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/ponor.pdfIn PDF document text
    • http://knauto.com/upload/file///gekeg.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/zefanos.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141d933e8207---32264169796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=five+nights+at+freddy%27s+2+full+game+free+download+pcPDF 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_off0000bf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5C 11564 bytes
SHA-256: bfa3cba9abc895307e90b127d9f5fb095f2dbcaedfb629f5b4668d3a6b825475
font_01_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16688 bytes
SHA-256: 3f2874971d8c62fbfb850b39e90060515da9144649383ac71d9c578e605179ee