PDF malware analysis — malicious · 7285b5859a6b84b0

MALICIOUS

PDF

145.0 KB Created: 2020-06-06 07:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b4d52ecf7f5edd8f9eb1c9ffcd5a620e SHA-1: 424e47cb20c4be1ccbd8e85bc46388faed1f90b5 SHA-256: 7285b5859a6b84b040a556c97748b4c48a1bc3a773cb9244594aa9caaf116b3f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. These links likely serve to redirect users to potentially harmful websites or to manipulate search engine rankings. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to drive traffic or host malicious content.

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://rv1.voyagerwebsites.com/uploads/1/3/1/4/131483598/131483598.html#nbme+18+offline+pdf
- http://tiastokes.com/uploads/1/3/0/6/130621325/5b97173.pdf
- http://urfabulousownit.com/uploads/1/3/0/6/130620793/vivutezuda_xoxugububogo_famuf_mimodobe.pdf
- http://theputtingsquare.com/uploads/1/3/0/3/130312916/madexelokegi.pdf
- http://elisabragagastronomia.com/uploads/1/3/1/4/131406714/pizumojoros.pdf
- http://brownbabybrigade.org/uploads/1/3/0/7/130775584/5533900.pdf
- http://rv1.voyagerwebsites.com/uploads/1/3/1/4/131483598/terms.html
- http://rv1.voyagerwebsites.com/uploads/1/3/1/4/131483598/dmca.html
- http://rv1.voyagerwebsites.com/uploads/1/3/1/4/131483598/policy.html
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://zikusale.files.wordpress.com/2020/06/pafedizutidut.pdf
- https://xewugof.files.wordpress.com/2020/06/mapaguduwivanoketukigusez.pdf
- https://pofulekat.files.wordpress.com/2020/06/migavalozuvavetokemadabe.pdf
- https://tosukovexe.files.wordpress.com/2020/06/wosubifiw.pdf
- https://koxifolaligu.files.wordpress.com/2020/06/rimebuwenokab.pdf
- https://womotisuxapo.files.wordpress.com/2020/06/karobarevosuwajoruri.pdf
- https://fuwikevon287342484.files.wordpress.com/2020/06/81915550922.pdf
- https://movugabopiru.files.wordpress.com/2020/06/vawobabujaxubek.pdf
- https://talejizugu.files.wordpress.com/2020/06/50642000211.pdf
- https://muketomed.files.wordpress.com/2020/06/36968680179.pdf
- 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_off000205f3.bin` `d26a0976435bf3b721a6354dbe9313a3e06b4eb59693c9af1097e43d3a1a21c2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x205F3	15296 bytes

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