Malicious PDF — malware analysis report

Static analysis result for SHA-256 3484b72fba5b639c…

MALICIOUS

PDF

68.2 KB Created: 2021-09-24 21:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4f98a0eb7b0bc3204730f026c0d8588 SHA-1: 5e0c44f5032eb519b6199e8abdb8f887256f2a9b SHA-256: 3484b72fba5b639cad78450faba65f77fefc3baec30e792dc56bc19ee6997c04
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and numerous unknown URLs were extracted, suggesting a distribution or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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 https://medicentrumnz.eu/medicentrum/files/file/37580481586.pdf In PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/xosuwotuninokajusu.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/favibov.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/fexisukej.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/madenasumekabesex.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/xutoperukoruraboka.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/lijibi.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/womusizanutafa.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/58777273896.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/851818038.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-09-08-49-06-55.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/demesosanukut.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/xividuzesarozebonova.pdfIn PDF document text
    • https://yasacompany.com/upload/files/miketonumozexuturoxig.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/tuvojevokutixokuxevidiwu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/redozid.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/10603871128.pdfIn PDF document text
    • http://euphoriaclub.fun4two.pl/uploads/assets/file/gexifegazuwuxoripozuvepax.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/bupipokefudexewagimoke.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/ninogejexerazux.pdfIn PDF document text
    • http://actinq.nl/upload/file/24412534073.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/rovedotivegupeze.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/58902563149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=things+start+letter+yPDF 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_off0000ae43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 15016 bytes
SHA-256: 06adc27cef4c9cafea2999892b531c0d80ffe194f2a54c524f066364f31da3db
font_02_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 10344 bytes
SHA-256: f0f318f537ec8c3a3b9ae39b5ad547ca37833eed67bdf0667bf78523f7f4fe40

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