PDF malware analysis — malicious · 1c8c81a8b0f27c8b

MALICIOUS

PDF

75.7 KB Created: 2021-09-25 04:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b0d39f1134e95ea6e1489845e01bbc09 SHA-1: 892a36e71afbb8de48516f27a580947b29e49109 SHA-256: 1c8c81a8b0f27c8b6f90aa85c87afb86f579551057e3f1678c2e78430c555545

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9950

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://garglob.ru/uplcv?utm_term=theme+download+android PDF link annotation
- https://promoform.coreform.it/uploads/file/29171572167.pdfIn PDF document text
- http://dienlanhhuubinh.com/upload/files/dogugotukud.pdfIn PDF document text
- http://flomojapan.com/upload/files/duwazujagijuj.pdfIn PDF document text
- http://ksnjl.com/userfiles/files/22362809545.pdfIn PDF document text
- http://riviera.az/userfiles/file/matawarafenitanirikazoje.pdfIn PDF document text
- http://patanamachine.com/imgUpload/files/fewozadob.pdfIn PDF document text
- https://apc-algercentre.dz/ckfinder/userfiles/files/zuvopunefufeji.pdfIn PDF document text
- https://sweetburden.com/upload/users/files/6051136270.pdfIn PDF document text
- http://asavn.vn/uploads/userfiles/files/dasegipuvibiwareba.pdfIn PDF document text
- https://artbynela.com/uploads/file/5414939696.pdfIn PDF document text
- https://nullemont.fr/nullemont/ckfinder/userfiles/files/46935122894.pdfIn PDF document text
- http://islenapuntos.com/campannas/file/ripekofara.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jtdt8gjfl9fr3b0pt5ebbhb7v8/98360927920.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/d09v107a7vsuqho5chsu44677t/57964652074.pdfIn PDF document text
- http://banghetretruc.com/media/ftp/file/fofogofonuwananapebaw.pdfIn PDF document text
- http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/wonamurokokorawudofepir.pdfIn PDF document text
- https://tsegypt.com/file/morokoparafemazanot.pdfIn PDF document text
- https://www.douggoodkin.com/admin/ckfinder/userfiles/files/kigomunerakem.pdfIn PDF document text
- http://ebus.cn/up_file/file/kosapifebu.pdfIn PDF document text
- https://kopari.hu/files/file/ruwodoguviwiworiliwo.pdfIn PDF document text
- https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/98073955289.pdfIn PDF document text
- http://sugarfree-gelato.com/upload/file/97124507814.pdfIn PDF document text
- http://www.jacenter.org/js/ckfinder/userfiles/files/73199487952.pdfIn PDF document text
- https://georeno.ca/userfiles/files/62445521162.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b223.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB223	16208 bytes
SHA-256: `77b02563a37549fc9230176e4cff07e8563c99d8eb1b2fd402b6493ed9f7280a`
`font_01_sfnt_off0000dbbb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBBB	16232 bytes
SHA-256: `01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684`
`font_02_sfnt_off0000f194.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF194	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000109ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109AB	10296 bytes
SHA-256: `b2d5692798b02af042dc77e8f1cb1a8b23a13184715270e526bce81da68d955f`

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