Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf2a197a72ad3cf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-25 01:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb6c2854cdf5896ad60937aed7c86baa SHA-1: dc1c7ce1d990c23a5c92e0a700408559118c2029 SHA-256: 8bf2a197a72ad3cfd3b51b37a41b9b9ac5a82606dac7a7bd28f7840aaeb8f5d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.likoda.com.tw/upload/ckimg/files/fawifop.pdf In PDF document text
    • http://www.urbanwaterways.info/files/58249277855.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/dolenikuwosebinuj.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/29261198236.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/46059606396.pdfIn PDF document text
    • http://fourfoods.com/images/files/robudiw.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tolejuwolugixarigu.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/15672349605.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/34093163060.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/5770231391.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147bd25c5614---3806952072.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/ninokupipunebivigezisuvo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139adc9a7901---litolirevepagi.pdfIn PDF document text
    • http://iucecb.com/files/file/sisagagukod.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/11827319677.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/55864487473.pdfIn PDF document text
    • http://mlight.cz/archiv/file/somutulijepasuzutat.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/mitaxivamanezejusuko.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/powisapavetelagit.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/gezevivedad.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021923156184396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jake+paul+disney+channel+bizaardvarkPDF 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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 10956 bytes
SHA-256: c01b984d80ebfca7787387f4c66b8d921ef0fdeb5f723c6d0f5cdc5d8dfd67f9
font_02_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 18576 bytes
SHA-256: a00ef08e93ca5ec5da31bb3f55163d2b5676829bda5ae42ef621741974021589

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