Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa7e80b4a9c3a91…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 07:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cbbedfb6a6702bab8c4113c136b9f3f2 SHA-1: 972d7ac66f9347b624753e34ef182b906c304d46 SHA-256: cfa7e80b4a9c3a910d5a21d3d8549669f3f076840d6b5b13d4faafcf98aaa3e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable domains, suggesting an attempt to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=how+to+download+movies+from+popcorn+time+on+android PDF link annotation
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/69952333546.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/rujojevesizivadaju.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/69205015470.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631415121GAgs.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/78081768643.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109162131139038.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jolotivepi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c3aef923---vinomubo.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/53931447355.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210907_D44B97B64CE1CCED.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/97513315544.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/sajisugenubapotirapenov.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/sofevujagigeval.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/59901262753.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/27171239435.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/41414124080.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/wujokuporebam.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jonigogikefaxikekurelire.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/29613162892.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/74614359597.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/4820463287.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_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 18804 bytes
SHA-256: 9afb6f03f76bebe63165422feb1c433297ca5fc3deae0ea56cb97f14d21ed803
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 10924 bytes
SHA-256: fdc7f3f7485e1c937d038f55530358654293d500a2b0e637fe1dc4e5684842b4
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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