PDF malware analysis — malicious · 7e000789aa2a2383

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 03:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 21a6ad39a827895e954a859ce7e5cf5f SHA-1: 5ae70b59b0aa814b04ddb349f4eccd19a1a90308 SHA-256: 7e000789aa2a2383e1b384477acb8287e5f0b8a89fd398a2c73c47b69f50683a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, and the numerous extracted URLs, many pointing to PDF files on various domains, support this. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or for SEO spam.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://versobrokers.eu/userfiles/files/pazugizedagika.pdf In PDF document text
- http://bangladeshceramicsociety.com/uploads/editor/files/dibuledarumedemedotipe.pdfIn PDF document text
- http://ouhkpthaa.org/userfiles/fozawivofurapafaper.pdfIn PDF document text
- http://haliburtonhighlandsheritage.ca/userfiles/file/lejetugokalejel.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b714d1be2---25976298026.pdfIn PDF document text
- https://hoangvan.vn/wp-content/uploads/files/dugijev.pdfIn PDF document text
- http://aceonlinementors.com/userfiles/file/segivilabomiro.pdfIn PDF document text
- http://celesteandtorsten.wedding/images/file/46393442067.pdfIn PDF document text
- http://ccsctda.com/ckfinder/userfiles/files/20210907_100725.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/sizop.pdfIn PDF document text
- https://giolog.biz/images/bulk_images/files/95634871316.pdfIn PDF document text
- https://heart-calligraphy.com/uploads/files/202109081951158548.pdfIn PDF document text
- https://esvigo.com/upload/files/11462907919.pdfIn PDF document text
- https://orangcar.com/app/webroot/upload/files/46317357578.pdfIn PDF document text
- http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/52724961585.pdfIn PDF document text
- https://bdata.vn/upload/files/faxisexipejusadudir.pdfIn PDF document text
- http://koreaseowon.com/ckupload/files/76669449491.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/90cb447caa8a70f5434e4f386e93c5bc/tevekoz.pdfIn PDF document text
- http://makesrealsense.com/ckfinder/userfiles/files/31591311445.pdfIn PDF document text
- http://vladekoservis.ru/files/dunukedexefawaxifaban.pdfIn PDF document text
- https://semut73.com/contents/files/mejazularufegu.pdfIn PDF document text
- http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/xewidaludipuk.pdfIn PDF document text
- http://llux.vn/uploads/files/44740564946.pdfIn PDF document text
- http://ros-grad.ru/fck_editor_files/files/53349313418.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=standard+deviation+and+normal+distributionPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d718.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD718	18016 bytes
SHA-256: `4c41103e1d92125e9c148a0dce72ac616e38d35251625ab3aeb18d2b2b11745b`
`font_01_sfnt_off0001066a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1066A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011e81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E81	10788 bytes
SHA-256: `c87d55846c801ca9d7e1cf5e4efb68066bf6db98e7b73a87e5108df8fd532e4a`

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