Malicious PDF — malware analysis report

Static analysis result for SHA-256 7530c54efad4f097…

MALICIOUS

PDF

77.8 KB Created: 2021-09-10 00:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04f42b7e42bf9dc45cfa1790710d1b1a SHA-1: afdb4e76ec4b60010045bf408921d7a71cefcb20 SHA-256: 7530c54efad4f097934c009f5d764ee53479678430e23f4dded298dba9042941
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, suggesting an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://best-label.com/upload/files/levugogugaweserom.pdf In PDF document text
    • http://khacvietlaser.vn/public/images_news/files/27991395577.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906073002.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210908181039.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/44724652220.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/migotilikof.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/pawoputuwajolugowezevupun.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/xeterifemipobiger.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jijujurenarizurif.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/46602441678.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/bepetixut.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/40c8046d4edcd28164c0dbef1ac73646/nabilisifile.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/vowugafugorikubonufa.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/97123665648.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/bizisefubabiregu.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/xosipiraziz.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gatejurifadopefupenaposow.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/gubazivugonakowovalo.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/46593160500.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/debidiwepodovibera.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/lugudijirelanuketa.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/d6agcmsolste0rshf5hkbimus5/jatitirosuvajula.pdfIn PDF document text
    • http://erpos.sk/data/files/58084141183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+update+facebook+app+on+android+phonePDF 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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 10912 bytes
SHA-256: e164d986de961243f71c577b78fc73887ac118778e6839117f3b191d12b9de4f
font_01_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 17868 bytes
SHA-256: e5a31ab11e0c90e87ef5cbe662f2d8c2e5170860320e3917b2ad37bbe0048d07

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