PDF malware analysis — malicious · 0f20aa6d73aeb494

MALICIOUS

PDF

36.7 KB Created: 2020-05-21 02:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 4b3965fea00e260430914a3be58d100d SHA-1: f39d6bb7e888dc23947420e034929bbc46f838ff SHA-256: 0f20aa6d73aeb49494f2c46984ab237e9ac484675e8a186d594f8e89bf5fa5ca

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted across numerous domains, indicating a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of many external URIs suggests an attempt to redirect users to potentially harmful content or to manipulate search engine rankings. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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 http://hartiemasa.com/uploads/1/3/1/3/131382470/131382470.html#simple+sentence+practice+1+worksheet
- http://dbmetss.nl/uploads/1/3/0/3/130323952/tufibila-widewi.pdf
- http://dodjikoffi.com/uploads/1/3/1/4/131406453/9321043.pdf
- http://cvvalet.com/uploads/1/3/0/8/130814286/bojokaxofisawirepef.pdf
- http://studyconnectnz.com/uploads/1/3/0/6/130639885/4adff44b8466bd2.pdf
- http://kimalbinms.com/uploads/1/3/0/5/130589124/burutazofip.pdf
- http://campusjobplacement.org/uploads/1/3/0/6/130621758/48d0cd7.pdf
- http://asistencia4x4.com/uploads/1/3/1/8/131856062/8759227.pdf
- http://nightstarpoetry.com/uploads/1/3/0/5/130540040/lilokerawanej.pdf
- http://lorneneufeldt.com/uploads/1/3/0/2/130270746/lelim_repopepipag.pdf
- http://jllcapitalmarkets55westmonroe.com/uploads/1/3/0/5/130551294/3288674.pdf
- http://gracethomaseportfolio.com/uploads/1/3/1/4/131483001/xibeno_zuwoxewizebil.pdf
- http://healthymumsprogram.com/uploads/1/3/1/3/131383646/3c2241be8d0.pdf
- http://gerbycollection.com/uploads/1/3/1/0/131070867/d171095f.pdf
- http://estherduvekot.com/uploads/1/3/0/8/130813658/19efc9.pdf
- http://ponilox.com/uploads/1/3/0/8/130873868/danelozag_koroboviw.pdf
- http://mrpeplin.info/uploads/1/3/0/6/130604285/dewumorero.pdf
- http://stlplaytherapyinstitute.com/uploads/1/3/0/5/130589322/1333489.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000062bd.bin` `1683f3d0948720b5b26e2aaaa3354dea7fc24aa0ef7c5e91d9d090d4904a186b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62BD	10576 bytes

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