PDF malware analysis — malicious · ca5449b5b6131d0b

MALICIOUS

PDF

76.3 KB Created: 2021-10-04 18:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 45e19f2f5dff952cbbf930230c71aca9 SHA-1: 82ebadae6d6db13cf4671f1be5033c24a36e9a31 SHA-256: ca5449b5b6131d0b468c5b1c3304f44d2a744dee092f2a53d06fb50627bed222

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=sales+increase+synonym PDF link annotation
- https://olivierdaulte.com/ckfinder/userfiles/files/90762780734.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/kelolunepixotil.pdfIn PDF document text
- https://mk-sito.it/uploads/file/49711709068.pdfIn PDF document text
- http://secretinvitation.net/images/files/94244416203.pdfIn PDF document text
- https://big-affaires.com/img/pics/files/63250009717.pdfIn PDF document text
- https://299-45.com/CKEdit/upload/files/vizeriza.pdfIn PDF document text
- http://madang.eu/f_pds/fck/file/jixebakanuzume.pdfIn PDF document text
- http://kammerchor-lindau.com/file/xuvasifav.pdfIn PDF document text
- https://estudiowebcolombia.com/ckfinder/userfiles/files/rejabaresatapoborexusa.pdfIn PDF document text
- http://lblussana.it/images/file/34441603083.pdfIn PDF document text
- https://eguiders.com/uploads/77804858656.pdfIn PDF document text
- http://mackyz7automotive.com/js/upload/files/65406104740.pdfIn PDF document text
- https://xn--z4qq44i.xn--kpry57d/upload/actfiles/65919011971.pdfIn PDF document text
- http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/7dcaf75b75b2e1431e5d566cf5a8f46c/92925991080.pdfIn PDF document text
- https://weborder.cloud/userfiles/file///budabojez.pdfIn PDF document text
- http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/60639406716.pdfIn PDF document text
- http://7seapharmtech.com/Uploadfiles/files/53771363071.pdfIn PDF document text
- http://papienbanana.com/user_file/file/5538154739.pdfIn PDF document text
- http://yieldpharm.com/upload/files/13792515824.pdfIn PDF document text
- http://bukharajohnscreek.com/sites/default/files/file/21582238983.pdfIn PDF document text
- http://dd-eng.com/files/files/70650195427.pdfIn PDF document text
- https://taechoclub.com/FileData/ckfinder/files/20210928_BA539520FABB071D.pdfIn PDF document text
- http://larben.cz/media/images/upload/file/kuputotafa.pdfIn PDF document text
- http://nwatchonline.com/userfiles/file/sebibuxudikijegugunes.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_off0000c4ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4FF	10484 bytes
SHA-256: `6cde0e3b6f2e155285ec974d6d1d96601d28054622bde2346484ac68cc29c5a4`
`font_01_sfnt_off0000dcbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCBC	17792 bytes
SHA-256: `e2aecd8622d8e920cb88dac56c7ff5d946e81e8b76ad1b8f903d9fb40b9f9ca8`
`font_02_sfnt_off00010b35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B35	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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