PDF malware analysis — malicious · b842bca16b2f0d71

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 00:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: ef412cc6f8b6ffc5ea276729a65cb723 SHA-1: 2c57810c5003a4388e183478f03eadd0d90c3a01 SHA-256: b842bca16b2f0d71a1848ca833dcdd3a53664a9327c3d305dd925a76cbc4f8f1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=miui+13+phones PDF link annotation
- http://designklasse.de/ckfinder/userfiles/files/zedekakevafefeku.pdfIn PDF document text
- http://mictrogiang.com/userfiles/files/mufoporesakake.pdfIn PDF document text
- https://terlickodds.cz/www/www/fckphotos/file/40868161921.pdfIn PDF document text
- http://cobe-ing.it/userfiles/files/29117624644.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/34911787252.pdfIn PDF document text
- https://oldgradeducation.com/ckfinder/userfiles/files/10461397641.pdfIn PDF document text
- http://ukrfirework.com/images/file/20087128507.pdfIn PDF document text
- https://eghamatyab.com/basefile/bainbookcom/files/sukunejasob.pdfIn PDF document text
- http://hourinkan.net/js/upload/files/82263915821.pdfIn PDF document text
- https://drhuanghair.com/uploads/files/202109170533023496.pdfIn PDF document text
- http://emusicmarket.com/upfile/board/files/sojuvebek.pdfIn PDF document text
- https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/domasazatilazutadasow.pdfIn PDF document text
- https://oykufestivali.com/ckfinder/userfiles/files/61147619396.pdfIn PDF document text
- https://otoform.com/upload/ckfinder/files/33313819104.pdfIn PDF document text
- http://phupmirpol.pl/userfiles/file/jarepavalidufetuv.pdfIn PDF document text
- https://truckforceone.eu/upload/editor/file/51291310161.pdfIn PDF document text
- https://nbcmedia.vn/ckfinder/userfiles/files/27609701415.pdfIn PDF document text
- https://amigo-shop.105h.net/upload/files/45859769021.pdfIn PDF document text
- http://oprandi.it/userfiles/files/zenujupeduwuketaxeb.pdfIn PDF document text
- https://aiwatopup.com/ckfinder/userfiles/files/114381900.pdfIn PDF document text
- http://didopack.com/files/tefolizomubewum.pdfIn PDF document text
- https://ever.dacola.com/upload/files/sibikiborefotid.pdfIn PDF document text
- http://slesnick.net/userfiles/files/ponuvipisomodawujuda.pdfIn PDF document text
- http://oasis-inwaste.asia/files/file/72627496587.pdfIn PDF document text
- http://permagnet.com/upload_files/file/21092010380895902892wg3o.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_off0000aef3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAEF3	14732 bytes
SHA-256: `486666a05a1275a70457f62dc99c46dbaac34cc2c1624a6ff1b5798eb5e8347a`
`font_01_sfnt_off0000d415.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD415	10260 bytes
SHA-256: `686dd3d11a63c790640f22564c2aae84ed9a7fa4d850853d4c2a3fe73619dcbe`
`font_02_sfnt_off0000eb21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB21	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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