PDF malware analysis — malicious · e7b2696b2bb0b28e

MALICIOUS

PDF

94.2 KB Created: 2021-02-11 21:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 59aebb412649a16f597820c8a983420d SHA-1: 0f316869c56d121ebc77df899af1fa1754240399 SHA-256: e7b2696b2bb0b28eedca0302b6db875243000f3f97af1c24c13e2ae2edefd71f

184 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://yafferge.ru/123?utm_term=photoshop+keyboard+cs4 In PDF document text
- https://babivefe.weebly.com/uploads/1/3/5/3/135312435/vadefazew.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393625/normal_5fd6538f49970.pdfIn PDF document text
- https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/6980344.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373753/normal_5fd3175c272f4.pdfIn PDF document text
- https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/8445916.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366366/normal_5ff8282ff2f0e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411935/normal_5fe81ef91f947.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368497/normal_5fd2267c9dc90.pdfIn PDF document text
- https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/6025022.pdfIn PDF document text
- https://wirupexulabajes.weebly.com/uploads/1/3/5/3/135322132/6886904.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4376874/normal_6025360108e7d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4464072/normal_60049ee249379.pdfIn PDF document text
- https://rafopotoze.weebly.com/uploads/1/3/4/6/134609035/8d0feaff4afa65.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4491432/normal_5fcede030be95.pdfIn PDF document text
- https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/xedame.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4420459/normal_5ffd1c1ad8679.pdfIn PDF document text
- https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/tadile.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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
- https://savannah.gnu.org/projects/freefont/In PDF document text
- http://www.gnu.org/licenses/In PDF document text
- http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010c61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C61	6744 bytes
SHA-256: `8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4`
`font_01_sfnt_off00011d48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D48	5524 bytes
SHA-256: `639a88bc5c503093037c1bc846da382c2897e0c1e87dd70edbfc625fcd8e4ae4`
`font_02_sfnt_off00013010.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13010	11032 bytes
SHA-256: `de936b9c5e36f65d41d649d71f56d54262fec828b7de8dabe80e75909cf6bab1`
`font_03_sfnt_off0001560f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1560F	16104 bytes
SHA-256: `7344026b335e0cba1f0137008c39d55b3777fd0f7c3f33ed204800b2ee817b24`

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