Malicious PDF — malware analysis report

Static analysis result for SHA-256 e400e8bd73f52a62…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 13:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4a07f33781454d7df606ab291c15802 SHA-1: 32fef5ac6f1ebf2ac88ec8779d3e86494d5c835a SHA-256: e400e8bd73f52a6260324f348160b1454550d32d14a68a8a0dcf489d52a46bf6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing attempt. The document contains a link farm with numerous disposable URLs, designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://autosoftware.company/autoresponders_images/files/44948676286.pdf In PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210914100917.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/78964097983.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/rukakamabokikopus.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65477104662.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/wifexofemugajitotik.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/perimurajirivotanibuv.pdfIn PDF document text
    • https://spyboarcams.com/files/gopakujesa.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/rewewi.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109180121138651.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/sunoxowobobebaw.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/fubipawutuleduwixoveb.pdfIn PDF document text
    • http://timocomputer.cz/files/file/kuvujukazaduz.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/wedowodasepaxipujaga.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/90402114762.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907002650411120.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/64723549569.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/28023735914.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614413112d5ab---27482217159.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/paziwozogijez.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/ridizirumejusekulufuzusu.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/44814637790.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/69632756241.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/40896936996.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614302618825f---wikasazogef.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/penele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=konvertor+mp3+downloadPDF 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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 10608 bytes
SHA-256: fee057a32880a0cf272e44d970e4c2c54047d02702ec704971336c186ec66780
font_02_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 18220 bytes
SHA-256: 0a80c8685665f644db403ee64f3eceab4c0ce19c5da074f0634ab3402a936fad