Malicious PDF — malware analysis report

Static analysis result for SHA-256 409b3bbae8219133…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 17:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af71f6a35c6aa89e475e1b51debe4831 SHA-1: ac7305c17ceb2be91af6bc89574d7c1b0cffe68c SHA-256: 409b3bbae8219133feff3042a9c1791fcc94bf175963738240ba19d11003fc79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and the high number of external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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.arborvitae.cz/ckfinder/userfiles/files/79547080714.pdf In PDF document text
    • http://potlista.com/file/files/57471306246.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/81048202978.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/tatadavixexiwudumapufo.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/terimowadukivuxuse.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/dagikiluboboleleg.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/75069217721.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/sejezedixeg.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161464a7f40949---38731585476.pdfIn PDF document text
    • http://strandedtattoo.net/file/kivoxo.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tipaxoridunawabifetasiw.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/27573589257.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/2111887829.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/69360503167.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/3156604667.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/46280206297.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/sejorokisadafitiget.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/pemiza.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210911080320_kg52bt.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/49090515838.pdfIn PDF document text
    • http://irinabailey.com/upload/files/deberapane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=como+usar+el+hotspot+de+mi+celularPDF 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_off0000aea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA8 14920 bytes
SHA-256: 48d56a92572cafe7eeedd448a33efe87cb0fa459ca1e158f198b4bf1ae91201b
font_01_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 10804 bytes
SHA-256: b37d13fa16b4f6c0ab053cb9afb9b99d73d24ee5396c31b13b7b1976c8fe594b

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