Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87d1e096b7bac5a…

MALICIOUS

PDF

100.0 KB Created: 2021-09-16 03:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bfcc98d2dc59f17cb3bbf69223a0543f SHA-1: 1e266f51ad2ee2b3549e9ed8c7b31aa6c714fcd2 SHA-256: e87d1e096b7bac5aee50beb108f9e31e0b657f7a62880362ce12a809d88b67ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using many distinct, disposable domains to obscure the true malicious intent. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crewmak.ru/uplcv?utm_term=pokemon+white+1+download PDF link annotation
    • http://antitumor.org/filespath/files/20210916074928.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/judodumiditevemunilumipi.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/18343903365.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/velezujugipadifopelebo.pdfIn PDF document text
    • http://regcureguide.com/files/files/29418578228.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-15/20210915185601457230.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/wezebexoxawa.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/75616517380.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/tuzetezafikavetid.pdfIn PDF document text
    • http://mobil-tech.com/files/23829472688.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/sivimobexurafopegenana.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/jewogipomamu.pdfIn PDF document text
    • http://rc-modeller.se/images/file///motedigixezijudud.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/51496981565.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/88333155241.pdfIn PDF document text
    • https://brs.jo/userfiles/files/zofiwufo.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/26428784454.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/popuvuj.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///22359267096.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202191_231115_933.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc6849acb---59874613961.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/449412cfc4a6f166c190942ef08f8b60/xogapovemilep.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/85778652779.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_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 22628 bytes
SHA-256: 94a7b59e8e6612e9766734fa7c88ed9657cf1a05b9edcaf4241d754a880196e7
font_01_sfnt_off000152b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B7 10476 bytes
SHA-256: f40f9eabd74819a6952d4ec50821ac516c472afd813f11845f3ccf2926031338
font_02_sfnt_off00016a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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