Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac5291f17671014…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 18:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 906c5c15dcb43dc6d0bc4f423706d018 SHA-1: 9c9c5ab7b58afbe0057535993ea559b99c55784f SHA-256: 7ac5291f176710140b20d0893d76306958eba57a9106979ccc605ace8e66a91b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=pirates+of+the+caribbean+violin+sheet+music+musescore PDF link annotation
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/8375081278.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/limejoxowuposejifipixul.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/finorak.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/1689402197.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/fupojesare.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/82098546973.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ff7cc9fa49a610a2d850688fa5eb0086/kunuwugon.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/rebojokelifiziliper.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/47171653308.pdfIn PDF document text
    • https://arendic.cl/files/62073658323.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/75921873551.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/44535567446.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/zirugam.pdfIn PDF document text
    • http://holzweiss.at/wofepuxa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613470ac1726f---tuporafidowibaxufadu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109162223117971.pdfIn PDF document text
    • http://bienbao.net/uploads/files/panuba.pdfIn PDF document text
    • http://zzquansu.cn/d/files/1567160522.pdfIn PDF document text
    • https://suncables.co/images/file/63468809304.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/nujebubipokirawew.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/nobetuzukifidasogoxuxawi.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/1955847242.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/27856065927.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/37193437299.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/52406046041.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/basapozefasoxax.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/jigeduzagivobutetozeriwe.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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 10908 bytes
SHA-256: b3128fefd8ee50304f1fa07b7578d800d14f990bd960a3246b60ac07d6b34ac0
font_02_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 17184 bytes
SHA-256: f1fcb532ae1cc4fbb781807ab1963de225f530933c39aa97d9f3d3a70063ab4d