PDF malware analysis — malicious · 6b836d8f420261eb

MALICIOUS

PDF

79.8 KB Created: 2021-06-09 12:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: feff62e568279d22a6972a5d4322f329 SHA-1: 84acbf9cb3b8f61ab09d4c42f232241b6b9e3beb SHA-256: 6b836d8f420261eb07fec627a83c5776e905fbd2b1a9d72fb423e480d670e742

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified as a link farm. Several heuristics, including ClamAV and an ML classifier, flagged this PDF as malicious, specifically as a phishing trojan. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/pbw?utm_term=founding+brothers+ellis+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4489983/normal_600022430d44d.pdfIn PDF document text
- https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/6301727.pdfIn PDF document text
- https://xonokuraku.weebly.com/uploads/1/3/3/9/133988937/ruduwikamudiv.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4391898/normal_5feafd88b9d0e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420917/normal_5fe971803d656.pdfIn PDF document text
- https://magirodimape.weebly.com/uploads/1/3/1/6/131637482/1619962.pdfIn PDF document text
- https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/wazebijudorote.pdfIn PDF document text
- https://molesomux.weebly.com/uploads/1/3/2/6/132681378/tebilanupigux_degadiwiduloru.pdfIn PDF document text
- https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/fa4d18.pdfIn PDF document text
- https://zikakivoso.weebly.com/uploads/1/3/4/6/134600150/kebuxoponik_xotofa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443602/normal_606ea3a50ece7.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4426418/normal_60b6925319878.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454436/normal_5fe607a192b9a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379852/normal_606bcbbaebdcc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388598/normal_605964c6eee13.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/712281d5-3425-4afb-8c44-6492fcf8a4fb/ingenuity_automatic_bouncer_not_bouncing.pdfIn PDF document text
- http://jajafad.pbworks.com/w/file/fetch/144777624/regresin_no_lineal_ejemplos.pdfIn PDF document text
- http://tiduxikuve.pbworks.com/f/8.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ba3549ed-ec74-4070-84bc-bd1dfe16e0b5/bosch_500_series_dryer_cleaning.pdfIn PDF document text
- http://jolunatimavu.pbworks.com/w/file/fetch/144839700/tariluwugarifofuxefo.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_off0000ea7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA7D	5072 bytes
SHA-256: `7470991177cf8baa90b0147df25296d219f7b062c1d88fa1c080c53139105658`
`font_01_sfnt_off0000fbb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBB3	12480 bytes
SHA-256: `53b02c541ae27e9f292363a3ff7c4a3c52cdca25f9d1d28825c02b31fc35f5df`
`font_02_sfnt_off0001241c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1241C	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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