PDF malware analysis — malicious · 204559f7cf353ac7

MALICIOUS

PDF

80.0 KB Created: 2021-05-21 00:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23

MD5: 2535c421c6c3eeb6d55946d501be8ec1 SHA-1: 80f30efcd605f642f25cbcbea770fd0a4e55a0d0 SHA-256: 204559f7cf353ac7a0c79c1b7817951f4c68fc2001001bc0f0f37d0e4ebe48f4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains numerous external links, a common tactic for SEO link farms and phishing campaigns. The primary malicious URL, https://kuzutuzo.ru/strik, is likely used to redirect users to a phishing site or download further malware. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to exploit users through deceptive content.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=cuentos+cortos+infantiles+ilustrados+pdf+descargar+gratis PDF link annotation
- https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/998c430472.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4416502/normal_605dcdb2ca1e1.pdfIn PDF document text
- https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/vetirimu_nunen.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4425005/normal_5fc8acdbd404c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4404739/normal_60054dd56a9c8.pdfIn PDF document text
- https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/9577050.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4448535/normal_6047e41096503.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4416665/normal_6022c0f91e972.pdfIn PDF document text
- https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/1798603.pdfIn PDF document text
- https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/9112ea636d5f9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387813/normal_604ee9511e150.pdfIn PDF document text
- https://rotaxini.weebly.com/uploads/1/3/4/4/134499982/fumejupi-bivokup.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/2f669307-e8a5-4ffa-a882-4f4db8d8cee1/15266617699.pdfIn PDF document text
- https://s3.amazonaws.com/vazisi/paper_plate_clock_pattern.pdfIn PDF document text
- https://s3.amazonaws.com/tokit/cover_letter_for_student_job_template.pdfIn PDF document text
- https://s3.amazonaws.com/fivebo/82245406627.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/91ef0f42-c859-41ea-b22b-f3308d295779/45046093957.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/00d92a77-b4ea-406a-ae3c-ee7a948657ac/40338044108.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2410a875-a0b3-4943-a202-cf38bf3d1f28/lowakotumozem.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/310882f1-d4d5-4b72-8a60-3f2a073945e3/bulova_precisionist_98b318_review.pdfIn PDF document text
- https://s3.amazonaws.com/liwafo/bad_blood_book.pdfIn PDF document text
- https://s3.amazonaws.com/sizabo/tonalo.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
- 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_off0000d912.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD912	5228 bytes
SHA-256: `df2254388ec42a205d9d06be947c8882ce9b61575ce73267b6c7f48ea26db50c`
`font_01_sfnt_off0000eadf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEADF	2116 bytes
SHA-256: `316f78c6e162999e43ccb83d429ef85c46045bf1ac59c77d169faf589ecd4eba`
`font_02_sfnt_off0000f489.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF489	11940 bytes
SHA-256: `b976f8c9e89ce067495b81cc0f15902074fea7be7b20e2c43d0b35b89ad898fe`
`font_03_sfnt_off00011bb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BB0	16392 bytes
SHA-256: `954f30c1cce2e3a00f07cb0ababb04bf86a3a3c34ed8da2fc782bdc014231390`

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