PDF malware analysis — malicious · 13c173c4481fc5d7

MALICIOUS

PDF

40.5 KB Created: 2020-11-06 08:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02

MD5: e667ef2f06ca85b0ee1f72a59338da6b SHA-1: d7af07033921c6880bfafffa6430f36002b3a6c3 SHA-256: 13c173c4481fc5d7fc8469f645b8ea2920e3982c6aa3a4b65c45c3719aee3e8e

104 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://traffset.ru/strik?keyword=rs3+premier+club+vault PDF link annotation
- https://cdn-cms.f-static.net/uploads/4383165/normal_5f910d340edf7.pdfIn PDF document text
- https://mabogafopesusa.weebly.com/uploads/1/3/4/3/134307699/fe618c90c7138.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445106/normal_5f9da65edae10.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/bikikanafopavu/92554957225.pdfIn PDF document text
- https://s3.amazonaws.com/henghuili-files2/71257541099.pdfIn PDF document text
- https://s3.amazonaws.com/tadovu/wipajasum.pdfIn PDF document text
- https://s3.amazonaws.com/sivanira/nedunuvur.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e8070388-5df1-481c-8c0a-a9f86e92e359/16461479709.pdfIn PDF document text
- https://s3.amazonaws.com/sazixipame/21895286856.pdfIn PDF document text
- https://s3.amazonaws.com/nokiva/wodemenivagoj.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_off00005e75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E75	5452 bytes
SHA-256: `4c4ac02f5123c9b1fcaaa2ac6fa072218e20250f5e398c0dc607326bb3e4ceff`
`font_01_sfnt_off000070ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x70EE	10892 bytes
SHA-256: `c1f9abd253a12349b11a2af2a31658f64c8ec4e0ce48d55894bb150a76a10b7a`

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