Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9efb702b7552fc8…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 14:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 399ee2552bca2bfa8cd9e822710e8d16 SHA-1: 2c36407cca5247a8886906f5f90020107bd39536 SHA-256: e9efb702b7552fc830dee0ce77b0eb2f5691992e61b7f7fa3ed5ba9e8b6bf91b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a lure to external resources. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm designed for SEO manipulation or traffic redirection, likely to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ingpiazza.eu/userfiles/files/36360152710.pdf In PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/disorexalokemuzunifabon.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/13008622725.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/54715045244.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/60120725710.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/feluxisonolapasavefizu.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dipazabutuzel.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/deviwula.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/dusonomovajudo.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/31602350295.pdfIn PDF document text
    • https://birotex.rs/images/files/35808309051.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/50337217490.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/67071883065.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e94b96a10---gosabenuretuperekibopon.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5924cff08f7d755f95b0a8451bd6abf7/19928138007.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/lavuzoxanumizoroniwebeb.pdfIn PDF document text
    • http://medrea.ru/upload/files/domixunowaxenuzarizegu.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210906152514699.pdfIn PDF document text
    • https://pmms-online.com/assets/file/mitufadalidukizewaxuvedo.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/14613641237.pdfIn PDF document text
    • http://capital96.com/userfiles/file/2949730057.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/54711002697.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/33121941484.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/13842283192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=shagird+full+moviePDF 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_off0000b4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 10672 bytes
SHA-256: ad23ac8585fbc2990d4d2aa4273fc77502b56aba9f4914891bb2b29189428a5c
font_02_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 16884 bytes
SHA-256: c44b846665d64245be99aef1a442555a138d7966210fa8df3c4166fe3ede44d9