PDF malware analysis — malicious · 853c8719252becdc

MALICIOUS

PDF

72.1 KB Created: 2020-12-08 12:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b9f868f3d9aae7768d6a00aec04465ac SHA-1: b2954eadfe86d1eadda7b1c07d1d0a34526376fc SHA-256: 853c8719252becdc7e06507a7a8befef0a070c46770147350ec59950ab75199b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to S3 buckets, which is indicative of a link farm or SEO spamming technique. One of the external URIs, 'https://traffine.ru/strik?utm_term=jang+geun+suk+2020', is flagged as suspicious. The ClamAV detection and ML classifier further support the malicious nature of the file. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

Nyx PDF Classifier malicious score 0.8413

Heuristics 4

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
External URI info PDF_URI

PDF contains an external URL action
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://traffine.ru/strik?utm_term=jang+geun+suk+2020
- https://cdn-cms.f-static.net/uploads/4369647/normal_5f8ce4e2d96bc.pdf
- https://cdn-cms.f-static.net/uploads/4390641/normal_5fa14dfeca202.pdf
- https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/d79df1fe627531.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/zufaxepixiguxax/ultimate_workbench_plans.pdf
- https://s3.amazonaws.com/pegebunov/gawaxavamoragevonerovur.pdf
- https://s3.amazonaws.com/tidigudetefumof/43861900167.pdf
- https://uploads.strikinglycdn.com/files/de027c12-c1ab-48f2-9c61-27d41fb02290/reading_and_study_workbook_pearson_c.pdf
- https://s3.amazonaws.com/jajoxulabojaso/bellsouth_net_email_server_settings.pdf
- https://s3.amazonaws.com/jemisajoda/cop_cam_instructions.pdf
- https://s3.amazonaws.com/novifamigot/xuzobumo.pdf
- https://uploads.strikinglycdn.com/files/cace0ba8-94fa-408b-9e11-ff21184c4c99/sodulilimekadopupekolot.pdf
- https://uploads.strikinglycdn.com/files/630c755e-78f9-4926-b49d-569db6f4a270/webitubibepege.pdf
- https://uploads.strikinglycdn.com/files/6cd0e819-75a2-423a-bfde-04ff826ba55b/prehospital_trauma_life_support_military_8th_edition.pdf
- http://scripts.sil.org/OFL
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c92f.bin` `1f4125aa3aa7e245e77549e886f7c4c4b50a1987a76b0a2f4e2ae1ac156e8a95`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC92F	2912 bytes
`font_01_sfnt_off0000d39c.bin` `f20c599cdd00f0c87c9dd05472797399c40abf18f36d58e78d3a0bb475e833de`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD39C	4696 bytes
`font_02_sfnt_off0000e394.bin` `98ff60ba4e447c26bc9080c5cb3779f2af757e87805066f66fb430234a51441e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE394	10472 bytes
`font_03_sfnt_off000107c7.bin` `25bea5b448335c23564653704c4f6c5477daa4b761eb732fa738313325ef7d23`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107C7	16104 bytes

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