Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cfbe32ff4bec5b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 10:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f7e28b6d623313a1f34abf63bb1d723 SHA-1: fa380a522338155086c1eecf798347ef7ed11429 SHA-256: 61cfbe32ff4bec5bfcc017ea2c6cdab0d215f61e3e79e30817160f17f7bd5ba9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The presence of a link farm heuristic suggests an attempt to obscure the final destination or distribute malicious content across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://klemanpince.hu/files/file/78568322412.pdf In PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/75464619399.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/somos.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/pudoxapaka.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e7b5f19---33769757225.pdfIn PDF document text
    • https://msvadba.ru/files/file/guxiravemugijazoju.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b10499ff97987d986077f3452fda7ad4/943176808.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/14869757982.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/mimitasug.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161413e8a42398---88929028240.pdfPDF link annotation
    • https://strechybenesov.cz/content/nonudoxodurejunis.pdfIn PDF document text
    • http://sartor.ru/upload/files/fawirutubike.pdfIn PDF document text
    • http://njxinbell.com/upload/files/39654616174.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/sozikikesojegawolilapaf.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/33082826498.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/24930767385.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/pepavejujijenewamuji.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/51839639633.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/23801215533.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tizavewutiruno.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/mogavugajosin.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090714483079624.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/90778460548.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/3393504108.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653c76e1f6---96177878248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+plus+new+versionPDF 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_off0000b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D4 10800 bytes
SHA-256: c9abd8b22ad2f1722febb30506a31225243996ef063a8cc17085dca76c360f91
font_01_sfnt_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16040 bytes
SHA-256: a439163e82c2671efa6b88b9d752161d27ca69390052e96ac92a8bdab36e0831

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