Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57b761448c1ddd9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 08:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 673a18c563b8c8bf821e559df5f1943d SHA-1: 96942b4e39559df3d861e952aec4ae21621c0666 SHA-256: b57b761448c1ddd978772d9716d9f82d72182a0fd8dcba9e620b9a59b5657eb0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also includes numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=1776+by+david+mccullough+pdf PDF link annotation
    • http://htygroup.com/upload/files/68532651037.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/karotomamowapefaxag.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/15050192118.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/wozetamapum.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/76946183957.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/43094227339.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/davuwetapekowapob.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/72271188966.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161430b15afd0b---57625066593.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210914_002705_156.pdfIn PDF document text
    • http://showdoimovel.com/files/files/12193031521.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/bijikapikivoguxorapusem.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/10587724630.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/47413099783.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/29430072590.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/xudirofu.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/2345757332.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/munelefo.pdfIn PDF document text
    • http://rococosofa.com/files/files/54516334462.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/25435641843.pdfIn PDF document text
    • http://vecsecity.info/editor_up/29187970812.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retexexepunitutoxen.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161361e79afa31---dutefewo.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/sexisasazir.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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 15820 bytes
SHA-256: 30b488262dcb2b1072392d2607b12a4a2df69bb9dd287b55aff7c67dd365383a
font_02_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 11060 bytes
SHA-256: fdbb3028909e9ee183e86e72408338e1656adef5349bc78146bedf62c5609ef3

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