PDF malware analysis — malicious · f2654f67136f5fe9

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 02:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 6664a6f863c23c64b80931602c53d59b SHA-1: 252bbf95d763923ccb91cf4251791cebc2c706d0 SHA-256: f2654f67136f5fe9483dc05b7e0400f554fbb7d17c51e442090acb1a63c46b1d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable hosting, suggests a phishing or malware delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is structured to host many links on disposable domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://dichvumayphoto.vn/webroot/img/files/13489034071.pdf In PDF document text
- http://www.smartusb.info/images/library/File/87442273123.pdfIn PDF document text
- http://strelnicebudejovice.cz/userfiles/file/zasuxiserugariwunoberat.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409d2be907e---tajubofiv.pdfIn PDF document text
- http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/71621532729.pdfIn PDF document text
- https://ferado.vn/userfiles/file/12715045647.pdfIn PDF document text
- http://pokebarslo.com/uploads/files/sisoba.pdfIn PDF document text
- http://cp-tournament.org/ckfinder/userfiles/files/wasijigosod.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/31964773948.pdfIn PDF document text
- http://ccsctda.com/ckfinder/userfiles/files/20210911_194914.pdfIn PDF document text
- http://eperon-kochersberg.com/img_db/12742616777.pdfIn PDF document text
- https://lesrimaudieres.com/images/uploads/file/mukibosumozakog.pdfIn PDF document text
- https://sankaibearing.com/userfiles/files/mogelobu.pdfIn PDF document text
- http://lapenya.cat/imgjovesnaves/file/80286584606.pdfIn PDF document text
- http://www.greddy.com/admin/common/ckfinder/userfiles/File/bideniroxulolufumebit.pdfIn PDF document text
- http://dochoiotovn.com/uploads/userfiles/file/68853981980.pdfIn PDF document text
- https://kovtec.pl/eurostyl/photos/file/peniduruxeduravovimafa.pdfIn PDF document text
- http://ltmetal.com/userfiles/files/pelitozepabam.pdfIn PDF document text
- http://wenyanchem.com/upload/files/41426212183.pdfIn PDF document text
- https://dimensioninteractive.com/WYSIWYGImage/file/mupumavajutexisup.pdfIn PDF document text
- http://kimwendelldesign.com/ckfinder/userfiles/files/49959253305.pdfIn PDF document text
- http://www.gonouvellezelande.com/files/56724991114.pdfIn PDF document text
- http://portaldeaquidauana.com.br/ckfinder/userfiles/files/65061870540.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5ed66ac1---72109490182.pdfIn PDF document text
- http://szentdorottyapatika.hu/files/vewav.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=square+root+of+31PDF 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_off0000b1e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1E1	17208 bytes
SHA-256: `ee8facf4f1f129476922177fe111a64a509280169a062c50a9fb85b80eba9dda`
`font_01_sfnt_off0000dd79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD79	10340 bytes
SHA-256: `07f4ee25cc08b4587f80093d9fa317ca527c8b810c3707b9279d19d70b584057`
`font_02_sfnt_off0000f512.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF512	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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