PDF malware analysis — malicious · 734e46f5586bcc45

MALICIOUS

PDF

86.8 KB Created: 2021-05-27 03:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 3ec17fd43d1bc6a485234b3c2c71e31c SHA-1: f4cb1aa0168c28d4ddec33e19d5983437db87b24 SHA-256: 734e46f5586bcc455f548dd150c7191c3576dbfd3c9d0f6ef8c2a3e334c2bb8e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to seemingly benign documents, but one key URL, https://pelibifir.ru/strik?utm_term=sci+journal+impact+factor+2020+pdf, is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=sci+journal+impact+factor+2020+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4365660/normal_601f70f4d2828.pdfIn PDF document text
- https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/b5ef3ee69.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476577/normal_6052b2858373f.pdfIn PDF document text
- https://namewedopuso.weebly.com/uploads/1/3/4/5/134583017/nixuroxogov.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446645/normal_6017579eca115.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443815/normal_603dc3b068062.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369518/normal_604f13c231e93.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369793/normal_600f995fbe351.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482869/normal_606622d720746.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4419410/normal_600bafad46434.pdfIn PDF document text
- https://vonulimuwudepaf.weebly.com/uploads/1/3/4/1/134131723/rujejilukiredud-dobagezagu-repidirer-luzelamebotifa.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4420775/normal_5fc8a346732b8.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4404296/normal_5feb4e10e15e5.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368244/normal_5ffad8b261bab.pdfIn PDF document text
- https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/borigexumakexi.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/0d56d9ab-6631-4984-a315-e03b1fe9d304/common_grammatical_errors_in_english_writing.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bf462f83-2510-49eb-a8a9-8bbd8f09ff01/how_much_does_an_ultrasound_tech_make.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d1f5a7df-5853-40b9-96a8-416a878117d5/karr_security_system_ford.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9707fe0c-0241-4ae0-9935-7a3f157bf99a/78728685917.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e697c9f5-4ece-4dfb-a91d-5690bbbacc40/how_to_use_a_polder_digital_thermometer.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_off0000f2d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D8	5340 bytes
SHA-256: `2aa78997b25e0e806fdf4435794ba53eab9196168303cd2726cca06b4d4956cf`
`font_01_sfnt_off000104d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104D5	11080 bytes
SHA-256: `3930d4b40e37bda872d1538ca365cfcc5429a0385ffa5b4a8227f3f678b25954`
`font_02_sfnt_off00012ac8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AC8	16060 bytes
SHA-256: `2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90`
`font_03_sfnt_off00013f5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F5F	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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