PDF malware analysis — malicious · 16ea311078ffce18

MALICIOUS

PDF

86.8 KB Created: 2020-06-09 00:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2cebdc2140b755cecbc2113dc35e179e SHA-1: a95405b25fa79528f38e2c6bfe131b5e724b6be4 SHA-256: 16ea311078ffce187968396646aa391833b1b4cbb74fe1b1544fd207c6bf7ab9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of the primary links is http://x0991726xstreamtravel.xsideas.com/uploads/1/3/0/8/130874567/130874567.html#nh%25E1%25BB%25AFng+ki%25E1%25BA%25BFp+ng%25C6%25B0%25E1%25BB%259Di+t%25C3%25A0n+trong+truy%25E1%25BB%2587n+ng, which appears to be part of a link farm. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the link farm suggests a potential for hosting malicious content or redirecting users to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://x0991726xstreamtravel.xsideas.com/uploads/1/3/0/8/130874567/130874567.html#nh%25E1%25BB%25AFng+ki%25E1%25BA%25BFp+ng%25C6%25B0%25E1%25BB%259Di+t%25C3%25A0n+trong+truy%25E1%25BB%2587n+ng
- http://houdinis.london/uploads/1/3/0/7/130776403/xunumapoxubuju.pdf
- http://services.cascadetech.org/uploads/1/3/0/6/130620865/32d41f05bb28b6.pdf
- http://businessbooks.dadgifts.us/uploads/1/3/0/2/130287886/8421771.pdf
- http://detransitionstudy.org/uploads/1/3/0/4/130483325/8ecb874.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://rigumiroviwe.files.wordpress.com/2020/06/lisiforiwutelikezelexijid.pdf
- https://xawuzebufo.files.wordpress.com/2020/06/zojawow.pdf
- https://jemoxevirez.files.wordpress.com/2020/06/lupipiz.pdf
- https://tofosigon.files.wordpress.com/2020/06/36073805754.pdf
- https://wefemimopo.files.wordpress.com/2020/06/50681626237.pdf
- https://mujejuzumupo.files.wordpress.com/2020/06/81131311764.pdf
- https://pomurulive.files.wordpress.com/2020/06/75345238786.pdf
- https://mowugowewuv.files.wordpress.com/2020/06/kazeborezanaxiwawugugozu.pdf
- https://migoxuwo.files.wordpress.com/2020/06/54350351958.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_off00011b42.bin` `496dfa7a96e6c2e448375b585aa419c49c02731a25b4a707dc50ea6553346054`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B42	23692 bytes

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