Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff4eec7ff536c0f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 06:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64967f342c5fcd5d483020929b65551b SHA-1: d92b70d31b8067faf0ff51b44af9dc285cea4335 SHA-256: bff4eec7ff536c0f390d6374b5c578a8b76e78df29d4ac1ecd3fbba6385e9bf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many of which are on disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=sviluppare+app+ios+e+android PDF link annotation
    • http://tiszaladany.hu/upload/file/16937385463.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/78522645886.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/44467921200.pdfIn PDF document text
    • http://a-pluset.com/userfiles/vojilidobujekutenimulu.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/72517233312.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/90070064017.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/34525992146.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/79065546739.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/22186123953.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/98904307405.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/gudibixobetiwukikasa.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/nidukekawar.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/11357137155.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/sezowutuwe.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/79974967555.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/27073296282.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tetodefuwibavovamejujopaz.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/vasobofexi.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/19237404654.pdfIn PDF document text
    • http://villkasz.hu/editor_up/19565115470.pdfIn PDF document text
    • http://penetrat.ru/files/files/xazonefijisafotaw.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/70ac1fecd512955334a950b8c8e9c9b2/78318846120.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/lodemoso.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/15340110194.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa761e87f---86992844222.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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 10528 bytes
SHA-256: e122259a8eeb901af129dae0e032659bc07a07f4ec0095c3ad1307a2652192b2
font_01_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16844 bytes
SHA-256: 1e02262e9dc3d319d471540916a9658084942491b41f0a170685db061a96fbf6
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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