PDF malware analysis — malicious · 7513cca769172271

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 06:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 026f9afa94d4a8046313c4531a992ef5 SHA-1: b3ac92e26980a3d61a7d89a733d832bac269f1fe SHA-256: 7513cca769172271772328e67e192c80bc929a4d7f9760299c839dd28a7c8f08

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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 https://chcial.ru/uplcv?utm_term=keeps+stopping+android+studio PDF link annotation
- http://paroissedementon.fr/upload/files/67058292334.pdfIn PDF document text
- https://www.aledrukujemy.pl/ckfinder/userfiles/files/situdotosapet.pdfIn PDF document text
- https://biblioteka-koneck.pl/ckfinder/userfiles/files/tevegadariregifuluxoxigo.pdfIn PDF document text
- https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f6ea7248074a7932c04ef3331656030f/67138544836.pdfIn PDF document text
- http://studio-rivetti.it/userfiles/files/gubarijit.pdfIn PDF document text
- http://ozdoby-betonowe21.pl/Upload/file/zenufamumux.pdfIn PDF document text
- https://abouelhoulgroup.com/userfiles/files/70391451489.pdfIn PDF document text
- http://www.stemcellhairclinic.com/files/files/mifamoredotiwexefoxim.pdfIn PDF document text
- http://nature-revive.org/files/file/12443459448.pdfIn PDF document text
- http://maility.pl/_ADRESuserfiles/file/32025583585.pdfIn PDF document text
- http://mutitar.com/user_img/files/purizemuxalitexaxivuxaj.pdfIn PDF document text
- https://konferencii.ru/js/ckfinder/userfiles/files/zikuxemisuziwunin.pdfIn PDF document text
- http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/13865665076.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/boxumax.pdfIn PDF document text
- http://finara-v.com/file_media/file_image/file/14115953106.pdfIn PDF document text
- https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/jedogezaxowone.pdfIn PDF document text
- http://xn--h49al71atridzo.com/userData/board/file/60104457375.pdfIn PDF document text
- http://thecountryclub32055.com/userimages/kejowuze.pdfIn PDF document text
- http://hilimall.ae/uploads/files/10368788165.pdfIn PDF document text
- https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/totofuwopuvo.pdfIn PDF document text
- http://ranch.pl/files/file/44542524481.pdfIn PDF document text
- http://stauarchitetti.eu/userfiles/files/66318690820.pdfIn PDF document text
- https://sonerofset.com/userfiles/file/38319186776.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f4e592e893dbfb88efe6e507dde46294/jopuj.pdfIn PDF document text
- http://bjavc.com/filespath/files/20210901125437.pdfIn PDF document text
- https://psihodesk.ro/ckfinder/userfiles/files/40500536164.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c408.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC408	16944 bytes
SHA-256: `5b20afa34eb95811c1f2e2f261e4f187fd99bb9edb1d18bf71d1c33369abc3bf`
`font_01_sfnt_off0000eff7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001080e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1080E	10612 bytes
SHA-256: `b2a70565f29451a15b27f7cf6e010ccaff67d3f426957baa61a45e01eac33ed7`

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