PDF malware analysis — malicious · 02c9b9454f037591

MALICIOUS

PDF

40.2 KB Created: 2020-06-08 00:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 794946f7e24cc411bee7860c9f76b44f SHA-1: 877c18bdad2908d0fae23e56a1193bd975d843c5 SHA-256: 02c9b9454f0375916efb077c7420c4bbde51b97d74d1d732eefb41797938248c

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm designed to manipulate search engine results, likely to host or distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this malicious intent. The presence of embedded URLs and the ML classifier further support the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://moniquestefens.com/uploads/1/3/0/9/130969235/130969235.html#l%25E1%25BB%258Bch+c%25C3%25BAp+%25C4%2591i%25E1%25BB%2587n+qu%25E1%25BA%25ADn+7
- http://krcommercialservices.com/uploads/1/3/0/4/130489157/vebak.pdf
- http://mcgservices.com.au/uploads/1/3/0/7/130740391/lewuvuro.pdf
- http://modernabuild.com/uploads/1/3/0/6/130621203/13b4255ba.pdf
- http://justrecipes.online/uploads/1/3/0/6/130639721/721244.pdf
- http://garrickinternational.com/uploads/1/3/0/2/130272573/faxobujipowum-bapudixujemota.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://zodajod.files.wordpress.com/2020/06/kerarenoketoji.pdf
- https://jagepoxuro.files.wordpress.com/2020/06/matasapuzumixusatijorewus.pdf
- https://detomanuz.files.wordpress.com/2020/06/17167609014.pdf
- https://tijizukoveb.files.wordpress.com/2020/06/losuralenonogejaburar.pdf
- https://dipowaza.files.wordpress.com/2020/06/16730836853.pdf
- https://fogojifoxuni.files.wordpress.com/2020/06/8032298835.pdf
- https://bakovenorow.files.wordpress.com/2020/06/ripofapesinof.pdf
- https://juzuzinon.files.wordpress.com/2020/06/mozumabawozigafixoxe.pdf
- https://xewowinupi.files.wordpress.com/2020/06/vigoxuxeganitananaj.pdf
- https://forifibavir.files.wordpress.com/2020/06/govatirogobitepinota.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_off0000646f.bin` `4923fd0261997dd3cb7c3b6a0fb4c08837aaafd61e1ea86585ef4d989e351bd6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x646F	20432 bytes

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