PDF malware analysis — malicious · b79ec8d63dd81431

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 03:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d73f0435f9d4f296c2f3fcfe6d9c09e7 SHA-1: d1975e1e6b8136ed8858dfa0ff859e7e4ea27d50 SHA-256: b79ec8d63dd81431126c7b6b5ca56d06ee37f0d0e481847531266028e4dcebbc

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, strongly indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=como+aumentar+la+sensibilidad+de+la+pantalla+tactil+android PDF link annotation
- http://kapelski.pl/userfiles/file/2763110082.pdfIn PDF document text
- http://erpos.sk/data/files/86644984980.pdfIn PDF document text
- https://ctcitsupport.com/media/files/47516736316.pdfIn PDF document text
- https://pastravariaizvoarelebratiei.ro/images/file/sifirelotizewitevujet.pdfIn PDF document text
- https://073741256.com/uploads/files/202109010154304953.pdfIn PDF document text
- http://tainanrup.longi.tw/uploadfiles/files/20210911_051312_6909.pdfIn PDF document text
- https://chambredhotes-savoie.com/ckfinder/userfiles/files/jukenu.pdfIn PDF document text
- http://zpkprzemysl.pl/ckfinder/userfiles/files/sizuvovasaxujupuvopotibob.pdfIn PDF document text
- https://hamasataccessories.com/userfiles/files/gilirimexavo.pdfIn PDF document text
- https://globalcareerclub.com/FCKeditor/userfiles/file/14107448648.pdfIn PDF document text
- http://bxbrdh.marketsearching.com/upload/files/zizekavogo.pdfIn PDF document text
- https://alwillislifecenter.org/ckfinder/userfiles/files/duwuwulexozabegu.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/309622d06ba981bd4da9ed61c25bc9e1/pawapifesafuxofaz.pdfIn PDF document text
- http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/musipewuxuxovekowu.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/vebowijilumetekaxubilitu.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a7c7b2413f9309ef634a9d6f3af643b9/41307422084.pdfIn PDF document text
- https://kawanmto.net/contents/files/novunisenolupodarudozopi.pdfIn PDF document text
- http://edilgroupdigiovanni.it/userfiles/files/rirusufaxenumosajunevan.pdfIn PDF document text
- https://baigiangtoanhoc.com/upload/files/xatomejemaruvizovugizi.pdfIn PDF document text
- http://webinaris.biz/ckfinder/userfiles/publics/files/jeperuvejuj.pdfIn PDF document text
- http://studio-rivetti.it/userfiles/files/xaxowubuxopi.pdfIn PDF document text
- http://uslugi-ogrodnicze.pl/pliki/File/12566750741.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_off0000dfa2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFA2	18380 bytes
SHA-256: `128d41bd64b618d650e75ee24bf53900f54c2d929d156f0a5c1487608576e72b`
`font_01_sfnt_off00010e90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E90	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000126a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126A7	10948 bytes
SHA-256: `97f99638f247f9ed9c6df6a7aba21061b0b2dbe055c5cfecd1c13371b12b29bc`

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