Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e891d78edb2e482…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 09:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed793254dcdb61ce6c635a6360f89eab SHA-1: 578a08b7068209f471074fb0911b2e343fd37720 SHA-256: 5e891d78edb2e482b2d56c100104d85e07bfe9621bb808b01d5eb619d9510995
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=transfer+files+from+pc+to+android+tv PDF link annotation
    • https://aimtronu.org/userfiles/file/75215361722.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/lolabaxipusuworozadafe.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210913000213.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/vefodotanini.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320075121c4---kelulitipado.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/duo8fibq3kcracqt4chpc693i5/21266577978.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/xexojun.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/nisesesaxopanutaluvolegub.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/16699019412.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/filuguroxijax.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/lupetofolireliwejibexot.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/damagega.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/50455528616.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/34049953998.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/laralovunatipizisofifud.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/41063050619.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/jisekane.pdfIn PDF document text
    • http://intertribo.sk/files/66556263271.pdfIn PDF document text
    • https://onlinendttraining.net/files/tafujidiniben.pdfIn PDF document text
    • http://checopharma.com/upload/files/66465027225.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mawuva.pdfIn PDF document text
    • 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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 10812 bytes
SHA-256: 3533051a79a457945ede470f0474a488abe1b3bd4668b14d4cb01f3d2826894e
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 16824 bytes
SHA-256: 77703351b6a159be07e085359c7eaf865c93afa2951a4802187a54a23fd62910

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