Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce342410865ca70…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 04:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c23755f0a34df232b83b0e39319464ed SHA-1: cf68475527bef0e6b9bd25eb174f7708d285c0f2 SHA-256: 4ce342410865ca708da5aac838c695b3b6728e02bf509581f255a56f4f7b0522
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=how+to+take+printout+of+contacts+from+android+phone PDF link annotation
    • https://mygoaltv.org/ipp/images/uploads/files/90806608235.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/10535440198.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/73074470724.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/guvego.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/petisugad.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/94885812522.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/volar.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/614525c59530c.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210904025609.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/23667707903.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/33925186418.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c06e43b636c2fcdd3d54fb46d4eeec9e/kupif.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/26846299038.pdfIn PDF document text
    • http://iphysiology.ru/upload/15805528331.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xemizopofawek.pdfIn PDF document text
    • http://arucax.am/user_images/file/bugulivir.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/wifogisila.pdfIn PDF document text
    • https://derfo.info/resimler/files/miduvemimugavova.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3282b4384d759b7ace0ff298d8d152c3/39112205870.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divinugakibuximebimonox.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/rulesozidon.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/kodinufavejidopider.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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 11108 bytes
SHA-256: 32eae7cd20c89c4b938e50245e6d1f1133cd34df69e976383e378775e4cbef26
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 17620 bytes
SHA-256: 2c2494d2dcaa779ca1d4bd694940b9c71d9442d30983f7a5af15da60d45d3374

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