Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9e188ed13aa617…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 02:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39f06686a612aad5958cba34194732c2 SHA-1: d641e0d52f0e8da07177125f2f4d8afd7b6a36ce SHA-256: fd9e188ed13aa61770cc69ae13e1e40178ba11e5bc210c696cf6b2fefee7169f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=how+to+cast+android+phone+to+tablet PDF link annotation
    • http://elturo.ru/img/upload/files/53956214620.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/39032833272.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1632003698.pdfIn PDF document text
    • http://hmed.vn/upload/files/wamajatedun.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/79198279761.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd9f264c9---sopoki.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/42268370691.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/69902562436.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/nupetelaxufad.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d934f4fdd7456c5fb307fb4f1c7d0072/mobomojezatozelugugi.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61246080662.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6130512C0CAF5.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/93107573813.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/41259863985.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/papibirepe.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/69088277518.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/sepasewab.pdfIn PDF document text
    • http://adveotec.com/img/file/9716033410.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/32627828902.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fesol.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/97094632621.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/69316671456.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210906_E8DBF2F87EE4DA12.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_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 17320 bytes
SHA-256: b8321f1f3f4cc223b62f651d1525bf81db30ffab1c9ac6e6557a7d588796dcd2
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 10828 bytes
SHA-256: 20fb83a660ff24255dc6fda8f72c35b85ade2eefba156dffe486b781875b5f44

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