PDF malware analysis — malicious · b20f0843c82506ab

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 13:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 792d5747583f1c0f547ab9662bf67d78 SHA-1: dd7dbde8135da5703fd5f0d41a09a2a550377df0 SHA-256: b20f0843c82506abe65628eafc34e3f5b224c8ecef761a5efa3c4430bf2d71c1

186 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 6

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.
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.
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://kuzutuzo.ru/strik?utm_term=manual+de+organizaci%25C3%25B3n+y+funciones+ejemplos PDF link annotation
- https://cdn-cms.f-static.net/uploads/4366309/normal_60531318b80bc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480594/normal_602be819d41d2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4500200/normal_5fe91c822d5be.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4459629/normal_5fdb0e2229f26.pdfIn PDF document text
- https://marajudalade.weebly.com/uploads/1/3/1/4/131438096/pamusukejezo.pdfIn PDF document text
- https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/gikawibo.pdfIn PDF document text
- https://farevilifowo.weebly.com/uploads/1/3/5/3/135390938/davoxe-juzigege-jotosowesib.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409257/normal_5fd3169383f73.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412382/normal_6048e2b3a4f49.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412763/normal_601dcde9a6742.pdfIn PDF document text
- https://nenafusorez.weebly.com/uploads/1/3/1/4/131453248/9543552.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4414500/normal_6023919e4afa7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4376098/normal_5fd9bd8f7adb9.pdfIn PDF document text
- https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/7549424.pdfIn PDF document text
- https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/fuximoju.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379035/normal_602a8b13cb056.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4457279/normal_60265ed4caa21.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412165/normal_605d89369815e.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/f1b85ff4-072f-4200-bfc8-a3e5cff37c06/how_to_tell_if_my_pcm_is_bad.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/837bf71c-5a78-4573-8d9f-b894e8e4a1c0/zegisuwupabisesosiz.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_off0000eab2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAB2	5648 bytes
SHA-256: `05bd94d86fdfe1b0660cf39d479884d2a12762000fa449db36b0d1e145b80463`
`font_01_sfnt_off0000fda2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDA2	11412 bytes
SHA-256: `845a5c3e3c8ead3993111f0fd380217a3ebd712365dd51714da20da74da1d1b7`
`font_02_sfnt_off000122d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122D3	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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