PDF malware analysis — malicious · 4fc5e8ee7da671e8

MALICIOUS

PDF

37.8 KB Created: 2020-11-08 12:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02

MD5: 7fc51319c5e850171dc5be78e180e811 SHA-1: 919af71cec4e2ed4e9a07c9d3f610a0b79cc083f SHA-256: 4fc5e8ee7da671e88a8d43d92332a0a854342d782ce1498a62bbe1b75d99c950

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 https://trafffe.ru/aws?keyword=donald+crews+shortcut+pdf PDF link annotation
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/xefejevife/bofelatoduwisazokoru.pdfIn PDF document text
- https://s3.amazonaws.com/bulozor/xilolibenijagipavusov.pdfIn PDF document text
- https://s3.amazonaws.com/rowubunak/disatubirutolukufaxozexes.pdfIn PDF document text
- https://gexaxigos.files.wordpress.com/2020/11/1st_birthday_invitation_card_template_india.pdfIn PDF document text
- https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
- https://zivujege.files.wordpress.com/2020/11/2878917950.pdfIn PDF document text
- https://moxafila.files.wordpress.com/2020/11/bokizunovuzufawodefu.pdfIn PDF document text
- https://s3.amazonaws.com/mudurixo/56198499625.pdfIn PDF document text
- https://s3.amazonaws.com/laradusa/vosurisumomigafuge.pdfIn PDF document text
- https://s3.amazonaws.com/wukara/xulolamem.pdfIn PDF document text
- https://s3.amazonaws.com/jufowokedunod/all_transformations_worksheet.pdfIn PDF document text
- https://wevixeda.files.wordpress.com/2020/11/mejejup.pdfIn PDF document text
- https://s3.amazonaws.com/kuboki/leparib.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000053a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53A9	5336 bytes
SHA-256: `b1fbc0da9b32cd7750d963b72fa969a877b5a0708b4e72dc847d8ba9fff17739`
`font_01_sfnt_off000065de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65DE	10760 bytes
SHA-256: `9d43fe203678100175f2fd9d7f263364545080e4b9714e9b0ba0b560e171d5d0`

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