PDF malware analysis — malicious · f10e957087901720

MALICIOUS

PDF

79.0 KB Created: 2021-05-30 02:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 6c875e6509065d2e941b92be2647d0ff SHA-1: 19be1c9d771a8506fa61a824af178f4e10f0c451 SHA-256: f10e957087901720236c8a289fbd7069e8564ae88475bf601b83a7c1ebd5017a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and 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 0.9998

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://crophysi.ru/strik?utm_term=accord+des+adjectifs+de+couleur+exercices+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4370076/normal_5fdd1d96d739e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455396/normal_606a8be6b9d65.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4401546/normal_5fe9b91ecfad5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413363/normal_601978dbbb70f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380229/normal_601b39ea02093.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4374956/normal_5fe020e2c6606.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443326/normal_60328938b4e9e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4503279/normal_60220f7080ad2.pdfIn PDF document text
- https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/9447529c55b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383132/normal_605b4b54d3e8a.pdfIn PDF document text
- https://rusajuse.weebly.com/uploads/1/3/4/7/134730125/zelisiniw.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4420917/normal_60081e194960a.pdfIn PDF document text
- https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/1605560.pdfIn PDF document text
- https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/c9d2acd04c.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://uploads.strikinglycdn.com/files/788bc6a6-476a-4216-8270-5bb8bb2e5535/what_is_the_universal_theme_of_beowulf.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/58cb9c76-83cd-4e19-b477-ca6e2174f6a6/in_christ_alone_sheet_music_guitar.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ddff2061-d6e9-4041-b358-998bdba00632/movezugubenenug.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c4f057f0-f54c-45ef-8800-018bea40ddc7/nigotaxuwa.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e51a0349-4cc8-49ea-a6da-0ba98dab8b7f/17540449068.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2e2bf8ef-faaf-4174-b08d-0dc8d809c14e/gefivoj.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e65b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE65B	5060 bytes
SHA-256: `c2a3103baa0828cab1c5621a768398170854c8594c779fa18448e7772f88d94a`
`font_01_sfnt_off0000f7ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7AD	12764 bytes
SHA-256: `b5048762453fdc453803886282eb1200216069dce41421866e26d3ebb96b8667`
`font_02_sfnt_off0001205b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1205B	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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