Malicious PDF — malware analysis report

Static analysis result for SHA-256 2413c9f4f083655f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 00:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c1fc2fdd237a06221d1bc459d5c23c0 SHA-1: e4e8a891b05f055fa04dadc2da1e1b6387873493 SHA-256: 2413c9f4f083655f980e74cd9f64c013814eddd8caa9d474d4c69a59afc139a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF hosts numerous links on disposable domains, suggesting a phishing or spamming operation. The presence of external URIs further supports the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://krisoc.ru/uplcv?utm_term=harry+potter+first+movie+watch+online PDF link annotation
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/34287577168.pdfIn PDF document text
    • http://citranco.com/users/files/62994947107.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/931846160.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/finitarisexexepon.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/xakora.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109070459533594.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/dogatukusonisafozutabef.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/75468663579.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/wuzet.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/96369916125.pdfIn PDF document text
    • https://riwg.in/userfiles/file/gevijesapunajotawor.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c4dbe91a764869bc13fcb4bd016ad493/zepomerodudoxupufi.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/gavewuniwulado.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/94823436332.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/45219450127.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/57933378342.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0ucrhjga5lkjg4eg84e3rg20sb/28761118068.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109030632498507.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/11181363371.pdfIn PDF document text
    • http://delve-cr.com/uploads/benefufumofira.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/laben.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/72617202022.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_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 17912 bytes
SHA-256: 94aad94008e8b2204f84cb054c6bc10ca7df66a7dc5f61d32e45dc47b4cf3fe8
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 11004 bytes
SHA-256: 6b64f3c30931e34c3a7abd379b9963ad762764027342616ade38359d147580b5
font_02_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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