PDF malware analysis — malicious · 8672ef53b46f9f44

MALICIOUS

PDF

85.6 KB Created: 2021-03-05 04:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: bfbbd0b6acd80a633618622969dce0f7 SHA-1: e8f8513c0b6462939ff26c94cb009151e31cd795 SHA-256: 8672ef53b46f9f44b16f7f7381cef47c55f1812e4d712cc6d24b0ac61605d654

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malicious redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://botokaw.ru/strik?utm_term=basic+korean+grammar+structure PDF link annotation
- https://cdn-cms.f-static.net/uploads/4452382/normal_602268add6c0d.pdfIn PDF document text
- https://midunaso.weebly.com/uploads/1/3/4/6/134680252/2005084.pdfIn PDF document text
- https://papukelub.weebly.com/uploads/1/3/4/6/134666119/1e4cd0d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4407818/normal_5ffca0532dae3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409997/normal_600cee6390391.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486548/normal_6035cbbeb4bb9.pdfIn PDF document text
- https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/8108743dc17.pdfIn PDF document text
- https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/16b78144d7.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421473/normal_5ff24de82f450.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470835/normal_60267ae6699a9.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_28bc558c90fc41b295f7ac46ea18afcd.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/wixamupelinere/waxedexoki.pdfIn PDF document text
- https://s3.amazonaws.com/jovekus/29296090474.pdfIn PDF document text
- https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_9e24c6ed21c446e8be02fa0d88ae00e5.pdf?index=trueIn PDF document text
- https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_074ce7b39a744cb1aa9ea86d8be5dac6.pdf?index=trueIn PDF document text
- https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_a73e1522a8e4478589f6f10b7c8e0446.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/folexapurilowe/clear_google_search_history_android_phone.pdfIn PDF document text
- https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_88a2758ccd05485da7417e7579adcea8.pdf?index=trueIn 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_off0000e9f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9F4	13432 bytes
SHA-256: `fc4483fabd5269f581f66879c0b844128b0d35400c30f5ddc6c8aeb484f3cfc0`
`font_01_sfnt_off000112cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112CC	5200 bytes
SHA-256: `fc947651bd44c61efecd92ab9610d3263794475d0bc23e9319867f7ab1755be5`
`font_02_sfnt_off0001246f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1246F	10604 bytes
SHA-256: `6f467d83ddc01bad6ebf7c79202b39936880e5ca4e2078a9e4e80cdd94ef3190`

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