PDF malware analysis — malicious · 8fb968658c408335

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 01:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1332a9929eb47b498968ad4b26785df4 SHA-1: 0285bf2c13c398222b104694584dad9e33360425 SHA-256: 8fb968658c408335192456c0750e3ef3f4f62cf8e036c64e6bb4627bd0cc2b8d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest an attempt to drive traffic to potentially malicious content, possibly for phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=sonic+all+stars+racing+transformed+download+android PDF link annotation
- https://www.asoriofrio.org/ckfinder/userfiles/files/sofalorofasukoxusi.pdfIn PDF document text
- http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/kuzubosafodefax.pdfIn PDF document text
- https://jotelek.hu/files/file/mologivepajer.pdfIn PDF document text
- https://ltssinternational.com/res/wysiwyg/file/kusowogitixi.pdfIn PDF document text
- http://fernandopelosini.it/userfiles/files/vigopugowod.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161403f70ee620---7337552364.pdfIn PDF document text
- http://nordicwalkingturak.hu/_user/file/87049429530.pdfIn PDF document text
- http://mai-colle.jp/userfiles/file/musasunefaposatodewuton.pdfIn PDF document text
- https://mobilaide.com/upload/editor/file/51848045173.pdfIn PDF document text
- http://sxsasa.org/images_fck/file/1630572747.pdfIn PDF document text
- https://pielinks.com/UserFiles/file/xagavafet.pdfIn PDF document text
- http://jedwines.com/cmsCart/upload/file/96566091576.pdfIn PDF document text
- https://ceccarmaramures.ro/userfiles/file/tuzelawiwofu.pdfIn PDF document text
- https://ambalatender.com/upload/files/86166321382.pdfIn PDF document text
- https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/duguwusaguruzibuzisitofil.pdfIn PDF document text
- https://ximatinhdongnai.com/app/webroot/files/images/pages/files/sukiluvesuzibowekulav.pdfIn PDF document text
- http://homeopathyhongkong.org/files/luvolimururivevolifeker.pdfIn PDF document text
- http://thingsantiquesla.com/userfiles/files/fazirut.pdfIn PDF document text
- http://geometracosentino.com/userfiles/files/nedezukenofefivijunuse.pdfIn PDF document text
- http://mundori.com/js/ckfinder/userfiles/files/jibologijozipuvavagikoba.pdfIn PDF document text
- http://coreaad.com/DreamDataUpload/file/datuwev.pdfIn PDF document text
- https://reparation-mobile.net/userfiles/file/96218191889.pdfIn PDF document text
- http://ekorepetycje.eu/Upload/file/gevikexusiravusene.pdfIn PDF document text
- https://szelvedojavitasmiskolc.hu/files/files/noriwuvipovidax.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_off0000bb8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB8C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d39e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD39E	18008 bytes
SHA-256: `c870d01a3f7bb50b0fb125f7479b8fa964a38d6ad1babf3c4cae7c173eb4a0c8`
`font_02_sfnt_off0001025e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1025E	10980 bytes
SHA-256: `799bdef83d0cb96896d087f2c19978cde35fc99e49818e7f2f892a6ca03698af`

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