PDF malware analysis — malicious · e741bfafad319a7a

MALICIOUS

PDF

39.1 KB Created: 2020-11-07 20:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04

MD5: c9c1a716bd1757e4ae041421022b88bf SHA-1: 16cbcaab86ffbc20170e55a6c44a5729668d5b1b SHA-256: e741bfafad319a7abc3fc74307163f75d6d460b73fb5c6961cd3faa1488e651d

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/123?keyword=nth+term+formula+finder PDF link annotation
- https://cdn-cms.f-static.net/uploads/4374188/normal_5f94ef3abec3b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386621/normal_5f9f6ff836ccf.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375509/normal_5f8eed46af252.pdfIn PDF document text
- https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/majevujug-luzokuju-zunupumumuzi-bufuwi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378390/normal_5f9395b1d22b2.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/aeea79bb-8e63-42c9-b204-56993f419d3c/18443180430.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/dac20c7b-9ab1-4109-aef9-a37b14944fdb/xdating_login_page_app.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7dd9158f-b3fd-4426-96ae-d218597a515c/9403874006.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c13ea032-ba50-4be0-b899-4c400fe6f92d/creative_bets_for_couples.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c641342b-df4f-4d11-b1f4-b3fdebf51325/bogilusoledasufifoviwa.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_off00005c20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C20	4936 bytes
SHA-256: `13845e3ec7cd309473034509b8d3c8db98315fa8b6fbdfdd22e184939f7264b5`
`font_01_sfnt_off00006cbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6CBC	10288 bytes
SHA-256: `6c6f57bfc7b34e003effcdb48784ae020be6fe5f417e8ed5ac74078e9801c7ef`

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