Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5c74095605a125…

MALICIOUS

PDF

97.5 KB Created: 2021-09-17 04:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba721abe2894bfe673ddda795837c32a SHA-1: 1ed931d8df9bc49d5c1e0d07d03b3949fd6efc29 SHA-256: ce5c74095605a12549ea701cfe01aa891a826ed400b6dc7c5f07bf1bb0f7d357
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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 https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/u0c90e87lsv257uo6lhdkicdtq/donevigojabu.pdf In PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912205752511031.pdfIn PDF document text
    • https://brukspec.pl/upload/file/zavis.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/zokuger.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f37725e47---suxofekejubid.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nemexisujifepa.pdfIn PDF document text
    • http://newo.ru/files/files/tejodajasiminukuni.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/9582340751.pdfIn PDF document text
    • http://yukamifashion.com/upload/files/81490658173.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/runusofuvubisoju.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/67222609457.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/32177103922.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/kiwiran.pdfIn PDF document text
    • http://unibox.lv/files/text/libijaxobig.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/596041321.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/pidewuzegosavipi.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/mazonuzugerudasi.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/15412470411.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/funivumutub.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/pokunonozatoriwux.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/rulokoguriwegomefijo.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/koluropimibuvoluwegu.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68582538379.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/66758625429.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/77589346522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tor+browser+mod+apkPDF 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_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 10496 bytes
SHA-256: 0ce8d18a559acde993040b9200559c614898f0577690eb02413dd81a91ca4d5f
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16452 bytes
SHA-256: f20c9f18f79a34c2e4d40d68333d2a1dfdce20826a6e2197ca6671d5d1db2e33
font_03_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 24480 bytes
SHA-256: 9f50caac325cfcb89cfe8f65611c923142de07724497f7807750796e54a9b533