Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55d9362b63bd445…

MALICIOUS

PDF

76.6 KB Created: 2021-10-12 23:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c218260f646ec1d9d78a9e6c5ea48f5 SHA-1: f600b8ddb9484ec3edf6decae2ff32f576ad88b6 SHA-256: b55d9362b63bd4459889c9d4bc9d4f8dc552134854b7234040046b4a5daaea6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to distinct domains, suggests a link farm designed to manipulate search engine results or distribute additional malicious files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://coreaad.com/DreamDataUpload/file/82309315222.pdf In PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/54515203693.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/wolopoma.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/wopodasamoxepofar.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/86319379827.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/joredew.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p5chbsqrk9nenubdo5137u8qsk/podulaw.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/15453575556.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tewurugapineteva.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/78454268905.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/21115897686.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fipajoja.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/tizotorinaviduzowotiguduj.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161570610caf39---fowolajesi.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/66775894368.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/gevelenejusaga.pdfIn PDF document text
    • http://preiss.at/upload_files/files/midar.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/82928775538.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/87411030207.pdfIn PDF document text
    • https://turbooto.vn/upload/files/69029850141.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/83184148504.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/mativijotivodezuteka.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=crush+mp3+song+downloadPDF 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_off0000c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC471 18384 bytes
SHA-256: 2113447862209deeb985505a983f3b31e0b3de4bc999d4eaab11dbd365c71f6b
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 10904 bytes
SHA-256: cf5eacb17ee7f5da8d910e970eac6813e8eb7972b7c8a505ad1b4c7b554dd8ac
font_02_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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