Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc127478c40d64fd…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 18:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8656ea718a2857c528b049da873235ec SHA-1: 1b52a1e1ed4f439ee92fe530c53c314a9efda2c8 SHA-256: cc127478c40d64fd70d34da1abf1aa0d4a2dc1ddc08244e184c6737bb187918c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, suggesting it's designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/53209728174.pdf In PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/18807204685.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/73806244412.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/kawagusuxijitubalibatag.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/kolaxexi.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/xanigerotegigali.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74563356934.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/7831962049.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/54998770981.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/33670125344.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/kuzokarotowarevepekerape.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/34935560249.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/lovedowodolimatirupojora.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ea7e3431---7576500472.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/66600874468.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/fopidiliretivomajamosaz.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/wukonefuregososiralunafur.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/nolavisujetul.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/99524423040.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/zuzomivipebudugigaselexo.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/41942584289.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qc10itce6dh2jbmvhq6artrlh2/ximaroruzakukazepafopiso.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904122919417.pdfIn PDF document text
    • http://abnicum.ru/files/file/89394381973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gh%C3%A9p+c%C3%A1c+file+pdf+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 16392 bytes
SHA-256: 4bda4602a0d34d07876f9d94905d54e7a46441902a45484036e584d4fd1130ad
font_01_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 21644 bytes
SHA-256: 9f8c619df740aab803bde35aee4418722ea04afce94b82393ecb7ef7747e56ad
font_03_sfnt_off000135d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D1 10560 bytes
SHA-256: 2078ad18cadcfdafdd8760b68e5a140c5db6a76571924d14ded061a2c555d5f2