PDF malware analysis — malicious · b18588ddb9175d9c

MALICIOUS

PDF

82.5 KB Created: 2021-04-18 17:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 6b75ae0e216ce71fba71b41191378fbf SHA-1: 7231afde78f7a2131e30a31be2e607c19f960fa5 SHA-256: b18588ddb9175d9c97f223f9602417f51fdb17e081f5f812f2bca9c1ddfbcabb

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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=what+is+the+british+standard+for+safety+glasses PDF link annotation
- https://static.s123-cdn-static.com/uploads/4407081/normal_5ff0162d3a2dd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412173/normal_6041305bc5424.pdfIn PDF document text
- https://xapunuzut.weebly.com/uploads/1/3/4/6/134683745/f7540.pdfIn PDF document text
- http://jonixumuxa.iblogger.org/gidiwu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420604/normal_60368163190da.pdfIn PDF document text
- https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/3d147553fdf.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4460968/normal_5fd79bdfc7077.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426686/normal_60176f1ddc332.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450870/normal_60145687934ff.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4444853/normal_6016f822e8be6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4489422/normal_5ff47b852cca9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4408875/normal_5fe1d4f8b28e2.pdfIn PDF document text
- https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/mubovetakezumevajeg.pdfIn PDF document text
- https://bumufufumobumag.weebly.com/uploads/1/3/2/8/132815806/fakud.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
- http://dotizedulowej.rf.gd/structural_reliability_analysis_and_design.pdfIn PDF document text
- https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_c2fb297369d7469cb97def7a1cc57784.pdf?index=trueIn PDF document text
- https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_db1bc8785d6e436fa9ab4d8e7a410f15.pdf?index=trueIn PDF document text
- https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_fbba5284a058444fabb332a8c19a29b3.pdf?index=trueIn PDF document text
- https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_81251d2f0f534bfda2f84400fc7fe600.pdf?index=trueIn PDF document text
- http://konezisuvalexer.epizy.com/citadel_paint_conversion_chart.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_off0000f756.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF756	5212 bytes
SHA-256: `bf595cb6aa07e133230db151b1c4ba081b1cda7540d6faa15e2150979229e506`
`font_01_sfnt_off0001090e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1090E	10984 bytes
SHA-256: `f4fd8574708e0f82cd1006d8fa7cf3bbb8679c28bc784610ca9bc23052b980dd`
`font_02_sfnt_off00012e5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E5D	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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