Malicious PDF — malware analysis report

Static analysis result for SHA-256 88265686c932ddaf…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 21:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9991097711f20eab9b0c6fa034474c79 SHA-1: 51b2a6a1327886f6e5514c93add6fa050c6f04a1 SHA-256: 88265686c932ddaf9c01e2d77a62bfbc8ceadcd2c0aa8bc10a4c7015c9a0adf6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it functions as a link farm and is flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. The embedded JavaScript likely facilitates the redirection to the numerous external URLs found, which are characteristic of phishing lures or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://k12kos.com/ckfinder/userfiles/files/47462339819.pdf In PDF document text
    • http://kxqcgs.net/filespath/files/20210911044330.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/fataxe.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/powosipuxejaloven.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///vajolizu.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/99029606515.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/11510758832.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/3465845275.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wojoliwufage.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/tuzotepovofibikegegixun.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/39405003639.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nifojilemofulezagelimofaw.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/48523000083.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/jetoneviteveberazekanujo.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/figafevabukinetepe.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/46233395524.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/64834446052.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/93728790127.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a88391e94133041fb74b1a046ce7e7a1/rewolafunozaxew.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/553478665.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/21586821786.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/siloxamivufodojiwogokupo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161447c4719711---dakefuxawepukiwinafemaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gun+fight+onlinePDF 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_off0000c526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC526 10200 bytes
SHA-256: 2ae71a2141df2ec5a42ff51799d957fc6446542c4e7c8ca78242ec9cec1a5578
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 16728 bytes
SHA-256: eaa85084b4686b84ae4ea90b00537800cac61d222cc2d22d3346249ea36425a0
font_02_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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