Malicious PDF — malware analysis report

Static analysis result for SHA-256 98febbe766c97e0c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 16:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 182d1845a8ceb27d03615a643a876745 SHA-1: ed8a16f1b0a71260c0954b513aef8cc6632f4472 SHA-256: 98febbe766c97e0cbcac9398513c5cad2197f6dc517e723a9dbf3cd822ebf81d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=adblock+pro+chrome PDF link annotation
    • http://bakersfield.thepokeluau.com/uploads/files/89540492201.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/79427593757.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/vudajavodapufabojosizalup.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/64523204690.pdfIn PDF document text
    • http://giga.sk/storage/file/82607568435.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/nubewapefoxafasoxakeguzu.pdfIn PDF document text
    • http://prmakeup.com/Image/files/62243927048.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/32787721861.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/23325206102.pdfIn PDF document text
    • http://24cvety.ru/upload/files/fewutorogetarajatopopubi.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/97111920222.pdfIn PDF document text
    • http://signauction.net/userfiles/file/pimadepuparudeg.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/52902945274.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/44176677653.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/podarovini.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210908080747.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/dotil.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/52746078796.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109030334172244.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/47202286853.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/14307295883.pdfIn PDF document text
    • http://chongros.com/userData/board/file/fimez.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/97838133081.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132668a623ed---rizub.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_off0000c13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13F 10368 bytes
SHA-256: 60c4e7f04c5cf9c16011b0f5a922f0fef02efec4701fd3f9086040dd43601465
font_01_sfnt_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 19476 bytes
SHA-256: 3b8606f24960b42a0de1b080eb30fc3d1bf16c46bcfe15e6ff4e597aa1af0fb4
font_02_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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