Malicious PDF — malware analysis report

Static analysis result for SHA-256 3268535b9c88321e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 21:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc721ab717cc30c656d735eaebacaa21 SHA-1: 74d537b4c9591e900551936dcf293b4002d81cbf SHA-256: 3268535b9c88321ec4b1ef7276587495200a7bb604232113babdded4cb9df4cb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload via one of the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://precedent.by/_newsite/images_from_html_editor/file/remevuguvija.pdf In PDF document text
    • https://dalycity.com/wysiwygfiles/file/molovaguketerozam.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/girobijidago.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/mixejororekakurezuma.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/xolisubederajinija.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/78687118141.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/ferudeba.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/94480201311.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/79222772205.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/xesutixodozojuvamise.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/24583964905.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/betepukafodefejomefa.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/43687524291.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139991b96130---63523973823.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/63726557618.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/55466403738.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/68768896123.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/25079641782.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/22205009057.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/98915119386.pdfIn PDF document text
    • https://grandegroup.net/files/wenibubotow.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-18/20210918031300207408.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/gisosa.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fopapuxegazedomad.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/37522212707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kooku+web+series+download+filmy4wapPDF 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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 18120 bytes
SHA-256: 1a0396690e1cd5663569509d1901ad1a22621e0ec4a3b33c7bc977c5fbe867b3
font_01_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 11160 bytes
SHA-256: 5cb73313323074fb42a01eeb1298134958077c60df948316285aa13d9734af6c