PDF malware analysis — malicious · 129ff4c224fb4c3a

MALICIOUS

PDF

76.2 KB Created: 2021-10-05 10:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: fa4925d573b8ef0e95e20e8308b18b4e SHA-1: cf3f9cdae3f287a5d33582763f52f983152bc98d SHA-256: 129ff4c224fb4c3ad013810419306668d7e8297a4b084f914e36ee58ff9fa43f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also includes numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=function+of+leucoplast+in+plant+cell PDF link annotation
- http://carrozzeriardue.it/userfiles/files/kefubiburosunoxasufiw.pdfIn PDF document text
- http://kientrucphatloc.com/upload/files/65614299515.pdfIn PDF document text
- https://zoldlaptop.hu/ckfinder/userfiles/files/55638039148.pdfIn PDF document text
- http://gu-bo.cn/uploads/files/podudikomoxawesutopefu.pdfIn PDF document text
- http://eko-baby.ru/userfiles/file/rukawufadukosumubisisiv.pdfIn PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/lunuzogovazewama.pdfIn PDF document text
- http://nceed.kr/pds/userfiles/files/78325726379.pdfIn PDF document text
- http://terredellamagnagrecia.com/userfiles/files/29631019923.pdfIn PDF document text
- http://1night2day.com/UserFiles/file/pajefufamisasawigojudemu.pdfIn PDF document text
- https://parvazyab.com/basefile/api203/files/wamepiwumopexib.pdfIn PDF document text
- https://calson.garment-pro.com/ckfinder/userfiles/files/94161120250.pdfIn PDF document text
- http://drairtools.com/ckfinder/userfiles/files/tutifor.pdfIn PDF document text
- http://nano-vip.com/ckfinder/userfiles/files/vokavivelaxu.pdfIn PDF document text
- http://volareinmongolfiera.it/userfiles/files/memibudagufomudemifun.pdfIn PDF document text
- http://myagreement.com/UserFiles/file/84595661924.pdfIn PDF document text
- http://cascad-trans.ru/files/65044253234.pdfIn PDF document text
- https://maturana.cl/upload/file/72278745064.pdfIn PDF document text
- http://ecohouse-lab.de/userfiles/file/ruzepezagibazososoxagad.pdfIn PDF document text
- http://www.sandipmallick.com/fckimages/file/20164335375.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb1ef2ed6---mepuxipasegajumusubo.pdfIn PDF document text
- https://plewmal-d.com/Uploads/files/15552310845.pdfIn PDF document text
- http://daieimotors.com/js/upload/files/zosexuvuv.pdfIn PDF document text
- https://scalping.ir/data/files/file/59692279786.pdfIn PDF document text
- https://gs-hemeringen.de/ablage/userfiles/files/kenadatovogixanozonuras.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_off0000c46b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC46B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC82	10448 bytes
SHA-256: `c602ec116403b2a23c9f4f03decd9c9fa49f823697ef22bdf73b91a5e2b5f244`
`font_02_sfnt_off0000f458.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF458	18152 bytes
SHA-256: `62cc5cd8b0c81bed241d4d1b5a799f115a7657548ec823f876b883da5bccd315`

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